NSSDC/WDC-A-R&S 89-08 SMITHSONIAN ASTROPHYSICAL OBSERVATORY STAR CATALOG (SAO) DOCUMENTATION FOR THE MACHINE-READABLE VERSION (VERSION 1990) Nancy G. Roman and Wayne H. Warren Jr. June 1989 November 1990 ABSTRACT An updated, corrected and extended machine-readable version of the catalog is described. Published and unpublished errors discovered in the previous version have been corrected, and multiple-star and supplemental BD identifications have been added to stars where more than one SAO entry has the same Durchmusterung number. Henry Draper Extension (HDE) numbers have been added for stars found in both volumes of the extension. Data for duplicate SAO entries (those referring to the same star) have been flagged. J2000 positions in usual units and in radians have been added. National Space Science Data Center (NSSDC)/ World Data Center A for Rockets and Satellites (WDC-A-R&S) National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt, Maryland 20771 TABLE OF CONTENTS Section 1 - Introduction and Procedure . . . . . . . . . . . . 1-1 Section 2 - File Contents . . . . . . . . . . . . . . . . . . 2-1 Section 3 - File Characteristics . . . . . . . . . . . . . . . 3-1 Section 4 - Remarks, Acknowledgments and References . . . . . 4-1 Section A - Addendum for 1990 Version . . . . . . . . . . . . A LIST OF TABLES Table 1 File Contents . . . . . . . . . . . . . . . . . . . . . . 2- 1 2 Explanation of HD Codes . . . . . . . . . . . . . . . . . 2- 5 3 Visual Magnitude Sources . . . . . . . . . . . . . . . . 2- 6 4 Star-Number Sources and Footnotes . . . . . . . . . . . . 2- 7 5 Photographic Magnitude Sources . . . . . . . . . . . . . 2- 7 6 Proper-Motion Sources . . . . . . . . . . . . . . . . . . 2- 8 7 Spectral-Type Sources . . . . . . . . . . . . . . . . . . 2- 8 8 Miscellaneous Coded Remarks for Duplicity and Variability 2- 9 9 References for the Source Catalogs . . . . . . . . . . . 2-10 10 File Characteristics . . . . . . . . . . . . . . . . . . 3- 1 11 References for Changes to the SAO Catalog, Version 1984 . 4- 1 12 Explanatory Notes to Individual Changes . . . . . . . . . 4- 2 13 Changes to the 1984 Version . . . . . . . . . . . . . . . 4- 3 14 Sources for Changes Since 1984 Version . . . . . . . . . 4- 6 15 Changes to the 1990 Version . . . . . . . . . . . . . . 4- 7 16 Sources for 1990 Changes . . . . . . . . . . . . . . . . 4- 8 ii SECTION 1 - INTRODUCTION AND PROCEDURE INTRODUCTION A character-coded machine-readable version of the "Smithsonian Astrophysical Observatory Star Catalog" (SAO, SAO Staff 1966) was prepared by T. A. Nagy (1979) from a packed binary tape obtained from the Smithsonian Astrophysical Observatory. In addition to certain format modifications, equatorial coordinates in radians and cross identifications from the Table of Correspondences SAO/HD/DM/GC (Morin 1973) were added to the converted version; however, the known errata lists were not incorporated at that time. This version of the catalog served as a starting point for the version described here. As a prelude to creation of the 1984 version of the SAO, a new version of the "SAO-HD-GC-DM Cross Index" was prepared (Roman, Warren and Schofield 1983), since most of the changes and extensions for the SAO involve data presently in the Cross Index. The original SAO did not use lower case letters, making some spectral types seem strange. All capital letters that really should have been lower case in the spectral types have been changed. These changes, which are numerous, are not listed in Table 1. The 1984 version of the SAO contains the corrected and extended cross identifications, all errata published up to January 1984 and known to us, numerous errors forwarded to us by colleagues, and errors discovered at the Astronomical Data Center during the course of this work. Recently, Clayton A. Smith of the U.S. Naval Observatory, volunteered to provide J2000.0 positions and proper motions for the SAO stars. These data have been added to the end of each record, the positions in both sexigessimal and radian form. Additional errors of which we are aware (as of May 1991) have been corrected. This document describes the current version of the machine-readable SAO Catalog. It outlines the procedures used to correct and extend the previous versions and is intended to enable users to read and process the data without problems and guesswork. The following section describes the analysis and methods used to cross identify the stars and to add component identifications for stars where more than one SAO record has the same Durchmusterung (DM) identification. Section 2 provides detailed descriptions of the catalog format and codes used in the data records, while Section 3 contains information on the characteristics of the magnetic tape file. Miscellaneous remarks and sources for the corrections incorporated into each version and in this version are given in Section 4, which also contains bibliographical references. A sample listing of data records exactly as they are recorded in the machine-readable form comprises Section 5. A copy of this document should accompany any machine-readable version of the SAO Catalog, originating from any one of the International Network of Astronomical Data Centers. PROCEDURE The assignment of components to SAO stars for which more than one entry has the same DM number was done when preparing the 1983 SAO-HD-GC-DM Cross Index. That procedure is described in Roman et al. (1983). A somewhat less detailed description is given here for completeness. Components were assigned according to the Index Catalogue of Visual Double Stars 1 - 1 (IDS, Jeffers et al. 1963; Worley 1980); for stars not in the IDS, components were labeled according to visual magnitude. Supplemental (footnoted) BD stars (Warren and Kress 1980) were identified and entered with lower case letters. Corrections and additions to cross-identification data were made as necessary. Some duplicate DM numbers actually referred to the same star for which SAO data had been obtained from different source catalogs. In these cases, one record has been marked "D" in byte 7, normally the one whose position was judged to be of lower accuracy. However, all data have been retained so that a different choice may be made by the user. Many stars occur in two DM catalogs (CD, CPD) in the southern hemisphere. The SAO gives numbers from different catalogs for the components of some double stars; hence, although there are no duplicate DM numbers, component confusion can occur. Although a search for such systems was not exhaustive, the catalog was searched for adjacent entries with declinations within 3 arcmin of each other. Most of these entries proved to be double stars and were appended with letter designations as if their DM numbers had been the same. These DM numbers were not changed. An important subset of rather bright stars in the published SAO Catalog has no DM numbers given. (Most of the stars in this subset were identified as FK3 double stars which were omitted from the FK4.) Many of these had been identified by W. L. Stein, who supplied probable DM numbers. The positions for these stars were compared manually with their positions in the various DM catalogs and many additional identifications were made. The Astronomical Data Center (ADC) has recently completed the preparation of machine-readable versions of the three DM catalogs: the BD, the CD, and the CPD. Using these versions, Mr. Barry Rappaport compared the positions of the stars in the Smithsonian Astrophysical Observatory Star Catalog (SAO) with the positions of the DM stars whose number had been assigned to each entry. A very lengthy list of possible assignment errors resulted. Each of these has been checked and the assignment corrected in those cases in which correction appeared desirable. In many cases, the assignment in the printed SAO is probably incorrect, but the evidence was not strong enough to warrant a change. As the Henry Draper Catalogue numbers (HD) had been derived from the DM numbers, those were also corrected as necessary. Although the "Henry Draper Extension" (Cannon 1925-1936) stars from "Harvard Annals", Volume 100, having DM numbers listed in the original catalog, were included in the SAO, those listed with AG numbers only (Astronomische Gesellschaft, zones +50 to +54 degrees, Harvard, Rogers 1892; zones +55 to +59 degrees, Helsingfors-Gotha, Kruger 1890) had not been cross identified and inserted into the machine version. The "Yale Zone Catalogues" (YZ, Barney et al. 1959a, 1959b), which identify stars by their AG numbers, but also give corresponding DM numbers, were used to cross identify the AG stars. This was accomplished by using the magnetic tape versions of the YZ and HD catalogs and matching the stars by machine. A cross index of Henry Draper Extension stars from "Harvard Annals", Volume 112 (Cannon and Walton Mayall 1949) and DM numbers (Bonnet 1978) was used to insert HDE numbers from the final HD volume. Since the GC (Boss 1937) numbers in the "SAO-HD-GC-DM Cross Index" had been assigned by comparing with HD numbers in the GC, stars without HD numbers in the 1 - 2 Cross Index were missing GC identifications. The magnetic tape file of the GC was therefore searched by DM number for all stars having no GC numbers in the Cross Index. Additional GC numbers were found manually (by position) for the few remaining stars without DM numbers. Fourteen GC stars were found not to be in the SAO Catalog. HD numbers in the GC were then compared with their counterparts in the Cross Index for stars in common, leading to the detection and correction of a number of additional errors. The catalog contains a numerical code appended to each HD number. The code originally followed the convention of the "Strasbourg Catalog of Stellar Identifications" (CSI, Ochsenbein et al. 1981) which assigned the numbers 1, 2, ... for individual components of multiple systems and the digit 9 if two contiguous HD stars are included in the entry (the lower HD number is usually given with code 9). Since the component codes were assigned to CSI entries without regard to letter designations, and because letter designations have now been added, the HD code was changed to a consistent indication of major contamination of the spectral type of the component to which the entry applies by the spectrum of another star (see Table 2). A visual magnitude difference of 0.3 mag was used as the limit for which contamination was indicated. Although photographic magnitudes would have been more appropriate, the visual magnitudes in the SAO appeared to be more consistent. Many HD numbers were added to the "SAO-HD-GC-DM Cross Index" and subsequently to the SAO, and quite a few incorrect HD numbers were changed. The SAO already contained spectral types for many of these stars; those types were compared with the types in the HD, and discrepancies were corrected only where it seemed desirable. For stars with new HD numbers and no spectral types in the SAO, the latter were inserted using the machine version of the HD for the main catalog and the first extension. Spectral types were read from the charts of the second extension ("Harvard Annals" 112) and approximately 5000 inserted manually; types were also inserted for other HD stars for which they were missing in the SAO. For components of multiple stars, spectral types were added or removed according to the likelihood that the star contributed to the HD type. Following completion of the Cross Index, all appropriate cross-identification data were replaced in the 1984 SAO. Additional corrections involving the SAO only were then made. In certain cases, SAO positions had been found in error, but correct positions in the SAO system could not have been derived without a re-reduction of all the original data. Since this would clearly have been impracticable, positions were taken from the "Cape Photographic Catalogues" for 1950.0 (CPC). (Errata for the CPCs have been published in the zone catalog for -80 to -90 degrees (Stoy 1968)). The CPC proper motions were applied to the positions at epoch to bring them to epoch 1950.0. In the 1984 version, a total of 12,373 SAO records was corrected or supplemented with 17,915 individual data changes. All changes are listed in the accompanying file of corrections (see Section 4). Changes in the 1989 version, from the 1984 version, are given in Table 13, and those additional data changed in the 1990 version are given in Table 15. As noted in the introduction, Clay Smith provided positions and proper motions at equinox and epoch J2000.0 and on the system of the FK5. 1 - 3 SECTION 2 - FILE CONTENTS A byte-by-byte description of the contents of the machine-readable SAO Catalog is given in Table 1. The suggested format specifications apply to FORTRAN formatted read statements and can be modified depending upon individual programming and processing requirements. All data fields with primary A-format specifications are blank for missing data; hence the alternate numerical specifications used for machine searches will produce zero values. Data are always present in fields for which primary numerical formats are given, except where specifically noted. Table 1. File Contents. Smithsonian Astrophysical Observatory Star Catalog, version 1989. Suggested Byte(s) Units Format Description 1- 6 --- I6 SAO number. 7 --- A1 "D" if this SAO entry refers to a duplicate star from the catalog. 8- 9 hours I2 Right ascension B1950.0 equinox and epoch. 10- 11 min I2 RA 12- 17 sec F6.3 RA 18- 24 sec/yr F7.4 Annual proper motion in RA. 25- 26 0.001 I2(F2.3) Standard deviation of pm (RA). arcsec/yr 27 --- A1 A "+" or "-" to indicate that the minutes of time associated with the seconds portion of RA (bytes 28-33) must be increased or decreased by 1, respectively; otherwise blank (if RA2 is the same minute as RA sec in bytes 12-17). 28- 33 sec F6.3 Seconds portion (RA2) of RA at original epoch, precessed to 1950.0 (i.e. 1950 position modified by proper motion). 34- 35 0.01 I2(F2.2) Standard deviation of RA2. arcsec/yr 36- 41 years F6.1 Epoch of RA2. 2 - 1 Table 1. (continued) Suggested Byte(s) Units Format Description 42 --- A1 Sign of declination. 43- 44 deg I2 Declination B1950.0 equinox and epoch. 45- 46 arcmin I2 Dec 47- 51 arcsec F5.2 Dec 52- 57 arcsec/ F6.3 Annual proper motion mu(delta). yr 58- 59 0.001 I2(F2.3) Standard deviation of mu(delta). arcsec/yr 60 --- A1 A "+" or "-" to indicate that the arcminutes associated with the arcseconds portion of Dec (bytes 61-65) must be increased or decreased by 1, respectively; otherwise blank (if Dec2 is in the same minute as Dec in bytes 47-51). 61- 65 arcsec F5.2 Seconds portion (Dec2) of Dec at original epoch, precessed to 1950.0 (i.e. 1950 position modified by the proper motion). 66- 67 0.01 I2(F2.2) Standard deviation of Dec2. arcsec 68- 73 years F6.1 Epoch of Dec2. 74- 76 0.01 I3(F3.2) Standard deviation of position at epoch arcsec 1950.0. 77- 80 mag F4.1 Photographic magnitude mpg (99.9 if no value present). When both magnitude fields are 99.9, the miscellaneous code (byte 95) should be checked for possible variability, in which case magnitudes may not be reported. 81- 84 mag F4.1 Visual magnitude mv (99.9 if no value present). 85- 87 --- A3 Spectral type ("+++" for composite spectra). 88- 89 --- I2 Coded source of visual magnitude (see Table 3). 2 - 2 Table 1. (continued) Suggested Byte(s) Units Format Description 90- 91 --- I2 Coded source of star number and footnotes (see Table 4). 92 --- I1 Coded source of photographic magnitude (see Table 5). 93 --- I1 Coded source of proper motions (see Table 6). 94 --- I1 Coded source of spectral type (see Table 7). 95 --- I1 Coded miscellaneous remarks for duplicity and variability (see Table 8). 96 --- I1 Accuracy of visual magnitude: 0 indicates that the magnitude in the source catalog is reported to 0.00 mag; 1 to 0.0 mag. 97 --- I1 Accuracy of photographic magnitude same coding as for byte 96. 98- 99 --- I2 Code for source catalog (see Table 9). 100-104 --- I5 Number in source catalog. 105-106 --- A2 Durchmusterung (DM) identification BD Bonner Durchmusterung CD Cordoba Durchmusterung CP Cape Photographic Durchmusterung All DM fields are blank if no DM identification is present. 107 --- A1 Sign of DM zone. 108-109 --- I2 (A2) DM zone. 110-114 --- I5 (A5) DM number. 115-116 --- A2 Component identification if there are two or more SAO stars having the same DM number. For multiple systems included in the "Index Catalogue of Visual Double Stars" (IDS, see Worley 1980) the IDS components are given; for non-IDS stars, components were assigned on the basis of magnitude. If two components of southern double stars are listed, DM numbers from different catalogs are often quoted for the components. In these cases, component identifications are usually given without changing the DM numbers. 2 - 3 Table 1. (concluded) Suggested Byte(s) Units Format Description 117 --- A1 Lower case letter identification for BD supplemental stars (Warren and Kress 1980). 118-123 --- A6 (I6) Henry Draper (HD or HDE) Catalogue number 124 --- A1 (I1) HD Code (1, 2, ... for component identifications where more than one star has the same HD number (not necessarily equivalent to A, B, ... or to the component identifications in the IDS; see Table 2)) 125-129 --- A5 (I5) Number in the "General Catalogue of 33342 Stars for 1950" (GC, Boss 1937). 130-139 rad F10.8 Right ascension (B1950.0). 140-150 rad F11.8 Declination (B1950.0). 151-152 hours I2 Right ascension for J2000.0. 153-154 min I2 RA 155-160 sec F6.3 RA 161-167 sec/yr F7.4 Annual proper motion in right ascension for J2000.0. 168 --- A1 Sign of declination. 169-170 deg I2 Declination for J2000.0. 171-172 arcmin I2 Dec 173-177 arcsec F5.2 Dec 178-183 arcsec/ F6.3 Annual proper motion in declination yr for J2000.0. 184-193 rad F10.8 RA (J2000.0) 194-204 rad F11.8 Dec (J2000.0) 2 - 4 Table 2 gives a detailed description for each HD code that can occur in byte 124 of a data record. Table 2. Explanation of HD Codes. Code Meaning 0 Single star or primary with a companion > 0.3 mag (visual) fainter. 1 Brighter component with a companion <= 0.3 mag fainter. 2 Fainter component with a companion <= 0.3 mag brighter. 9 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given. 2 - 5 Tables 3 through 9 give data sources and duplicity / variablility codes. Table 3. Visual Magnitude Sources. Photo- Visual visual Magnitude source 0 Does not appear in source catalog 1 21 Determined by source catalog 2 22 Determined by source catalog or by authority in footnote 3 23 Source cited in source catalog introduction 24 Source unspecified 5 Taken from "Bonner Durchmusterung" 8 Based on Durchmusterung magnitudes and visual estimates 9 Taken from AGK1 10 Taken from Cordoba Zones (Resultados) 12 Taken from CGA (Perrine 1911a, b) or Cordoba Zones 13 Taken from Harvard publications 14 Taken from Harvard or San Luis photometry 15 Taken from the "Henry Draper Catalogue" 16 Combined magnitude of component stars 17 Arithmetic mean of maximum and minimum magnitudes of a variable star Always check the duplicity / variability code (Table 8) when using magnitudes. When blank, code = 0 and field = 99.9. 2 - 6 Table 4. Star-Number Sources and Footnotes. Footnote without with Star Number 0 16 Source catalog only 1 17 Source catalog and BD 2 18 Source catalog and CD 3 19 Source catalog and CPD 4 20 Cordoba B (Resultados) and CD 5 21 Cordoba A (Resultados) and CD 6 22 AGK1 and BD 7 GC and BD 8 24 Cordoba B (Resultados) and CPD 9 Cordoba A (Resultados) and CPD When blank, the code for DM is 0 or 16, footnote is 0 through 9, and field is all zeros. Footnotes and star numbers are those appearing in the source catalogs. Table 5. Photographic Magnitude Sources. Code Source 0 Does not appear in source catalog 1 Determined by source catalog 4 Taken from magnitudes of the CPD and diameters of the Cape Astrographic Catalogue 8 Source cited in source catalog introduction 9 Columbia Contributions Numbers 30 and 31 (Schilt and Hill 1937, 1938) When blank, code is 0 and field is all zeros. 2 - 7 Table 6. Proper-Motion Sources. Code Source 1 Determined by source catalog 3 Determined by comparison of catalog and Greenwich AC 5 Determined by comparison of catalog and AGK1 6 Determined by comparison of catalog and Greenwich AC on the basis of the smallest difference in positions (see page xiii of source reference) 8 Determined by comparison of catalog and AGK1 on the basis of the smallest difference in positions (see page xiii of source reference) Table 7. Spectral-Type Sources. Code Source 0 Taken from the Henry Draper Catalogue or no spectrum in source catalog 1 Taken from the HD with M stars reclassified by Miss Cannon 2 Classified by G. G. Cillie 3 Classified by Goedicke 4 Classified by D. Hoffleit 5 Classified by M. W. Mayall 6 Classified at Leander McCormick Observatory 7 Classified by Nassau and Seyfert If the spectrum is composite, "+++" is stored in the field and the code is 0. 2 - 8 Table 8. Miscellaneous Coded Remarks for Duplicity and Variability. Code Meaning 0 No additional information 1 Double star - see source catalog for source 2 Double star in Aitken's Double Star Catalogue (Aitken 1932) 3 Double star in Burnham's Double Star Catalogue (Burnham 1906) 4 Variable star in visual magnitude in source catalog 5 Variable star in photographic magnitude in source catalog 6 Variable star in both magnitudes 7 Both double and variable, in either visual or photographic magnitudes When blank, code is 0, no field is involved. 2 - 9 Table 9. References for the Source Catalogs. No. Abbreviated Title 01 AGK2, Volume 1 02 AGK2, Volume 2 03 AGK2, Volume 5 04 AGK2, Volume 6 05 AGK2, Volume 7 06 AGK2, Volume 8 20 Yale Transactions 11 21 Yale Transactions 12 Part I 22 Yale Transactions 12 Part II 23 Yale Transactions 13 Part I 24 Yale Transactions 13 Part II 25 Yale Transactions 14 26 Yale Transactions 16 27 Yale Transactions 17 28 Yale Transactions 18 29 Yale Transactions 19 30 Yale Transactions 20 31 Yale Transactions 21 32 Yale Transactions 22 Part I 33 Yale Transactions 22 Part II 34 Yale Transactions 24 35 Yale Transactions 25 36 Yale Transactions 26 Part I 37 Yale Transactions 26 Part II 38 Yale Transactions 27 40 Cape Annals 17 41 Cape Annals 18 42 Cape Annals 19 43 Cape Annals 20 48 Cape Zone 60 Melbourne 3 61 Melbourne 4 70 GC 71 FK3 74 FK4 2 - 10 SECTION 3 - FILE CHARACTERISTICS The information in Table 10 is sufficient for a user to describe the indigenous characteristics of the machine-readable Smithsonian Astrophysical Observatory Star Catalog, Version 1990 to a computer. Not included is information easily varied from installation to installation, such as block size (physical record length), blocking factor (number of logical records per physical record), total number of blocks, tape density, number of tracks, and internal coding (EBCDIC, ASCII, etc.). These parameters should always be transmitted if secondary copies of the catalog are supplied to other users or installations. Table 10. File Characteristics. "Smithsonian Astrophysical Observatory Star Catalog", Version 1989. NUMBER OF FILES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 LOGICAL RECORD LENGTH (BYTES) . . . . . . . . . . . . . . . . . . . . 204 TOTAL NUMBER OF LOGICAL RECORDS . . . . . . . . . . . . . . . . . 258997 3 - 1 SECTION 4 - REMARKS, ACKNOWLEDGMENTS AND REFERENCES As mentioned in Section 1, the individual data corrections, additions and changes included in the 1984 version of the SAO Catalog number 17,915, with 12,373 records (4.8%) having at least one change. Since many of the changes involve corrections to data given in previously published catalogs, it is important for a user to have access to the individual changes if a discrepancy is found between this catalog and a previously published one. For this reason, we have prepared a complete table of all changes made to the previous version to produce the 1984 version as well as tables of additional changes in the 1989 and 1990 versions. The first corrections and changes table was prepared by comparing the uncorrected file against the new version with a computer program which compared the data fields one by one and produced a formatted changes table. The complete table for the 1984 version is given in the accompanying file of corrections. If a data entry is blank in either version, it is blank for the corresponding item in the table. The column labeled "S" gives the source of the change, as defined in Table 11 by its numerical code. Table 13 lists the changes in the 1989 version and Table 15 lists the changes in the 1990 version. Table 14 explains the codes for the source of the 1989 changes and table 16 gives the sources of those corrections in the 1990 version that did not result from the ADC checking of Mr. Rappaport's suggested changes. Table 11. References for Changes to the SAO Catalog, Version 1984. Code Reference(s) 1 Haramundanis, K. undated, "Errata Sheet for the SAO Star Catalog"; 1971, Note on SAO Catalog Errata (January). 2 Stein, W. L. and Rudisill, J. C., 1977, "Introduction to the Dahlgren General Catalog", Naval Surface Weapons Center NSWC/DL TR-3607. Stein, W. L. 1978, in Bischoff, M., Bull. Inf. Cent. Donnees Stellaires, No. 14, 2; No. 15, 103. Stein, W. L., private communication. 3 Bischoff, M. 1978, Bull. Inf. Cent. Donnees Stellaires, No. 14, 2; No. 15, 103. 4 Hoffleit, D., private communication. 5 Parsons, S. B. 1977, Bull. Inf. Cent. Donnees Stellaires, No. 12, 41. 6 Nagy, T. A. 1979, Documentation for the Machine-Readable Version of the "Smithsonian Astrophysical Observatory Catalog(ue)" (EBCDIC Version), Systems and Applied Sciences Corporation R-SAW-7/79-34. 4-1 7 Houziaux, L. and Blondelot-Lickes, J. 1970, Centre Univ. Mons, Fac. Sci., Dept. Astrophys., Communication No. 13. 8 Stoy, R. H. 1968, "Cape Photographic Catalogue for 1950.0", Zones -80 to -90 degrees, Ann. Cape Obs. 22 (London: Her Majesty's Stationery Office). 9 McLaughlin, S. F., private communication. 10 Bonnet, R. 1978, "Cross Identifications of HDE Stars", Bull. Inf. Cent. Donnees Stellaires, No. 15, 155. Magnetic tape version, CDS Strasbourg catalog number 4008. 11 Warren, W. H. Jr. and Kress, K. 1980, Catalog of Supplemental Stars to the Bonner Durchmusterung, Astron. Data Center Bull. 1, 19. 12 Errors and additions from the ADC work. 13 Schmidtke, P. C., private communication. 14 Herald, D. 1979, Occultation Newsl. 2, 49. Table 12 includes further notes on entries in the microfiche table for which additional explanations are considered useful to clarify the reasons for certain changes. Table 12. Explanatory Notes to Individual Changes. SAO Note(s) 6404 The GC incorrectly identifies this star as BD+76 309; GC 11190 is BD+76 309, while this star is +77 309. 9947 This star is misidentified as BD+70 1162 in the GC, as it is in the IDS and ADS (Aitken 1932). Source 3 corrects the DM number to +70 1161, assuming that the double entry for +70 1161 represents the two components of the double star. This is not the case. SAO 9949 is a duplicate entry and should be deleted. 15097 The GC incorrectly lists this star as BD+65 761. It is actually +65 751, while +65 761 is SAO 15120, which does not appear in the GC. 17589 The GC incorrectly identifies this star as BD+68x 936, whereas it is actually +69 936. 4-2 23221 Source 1 incorrectly gives this star as BD+53 568a. It is actually +52 568a. SAO Note(s) 24753 This star is listed as BD+57 825 in several catalogs. It is not in the proper position for the BD star, however. There is a star at the SAO position on photographs, but it is not in the BD. 29370 These corrections are probably in error. The BD gives +54 1724 29372 as being SW of +54 1725 and lists both star as magnitude 7.5. The SAO, AGK3 and IDS list the brighter star (delta m = 0.6 mag) as SE. the HD also lists the brighter star as south, but gives the same right ascension for both stars. The IDS identifies the brighter star as BD+54 1724, as do the HD and SAO, but the AGK3 reverses the DM numbers, listing the brighter star as +54 1725. 101858 Sources 2 and 3 suggested changing this stars to BD+17 2945. It is part of a triple system of which C, the fainter, more distant component, is +17 2945. SAO 101858 and 101859 appear to be the A and B components, respectively, of +17 2946. 238176 The GC is in error. GC 14513 is CP-54 3795 and is not in the HD. GC 14517 is CP-54 3797, which is HD 91593. Table 13. 1989 Changes to the 1984 Version. No. Field For Read S 5840 DM No. BD+78 222 21 9160 DM No. BD+69 993a BD+69 993 21 9773 DM No. BD+77 778 21 12509 Spectrum B: Bp 22 20758 DM No. BD+63 2030 BD+63 2030a 21 23221 DM No. BD+53 568a BD+52 568a 21 27123 DM No. BD+57 1199 BD+57 1194 21 29370 DM No. BD+54 1725 BD+54 1724 21 29372 DM No. BD+54 1724 BD+54 1725 21 39436 Spectrum B: Bp 22 45289 DM No. BD+46 2005a BD+46 2005 21 56771 Spectrum GO G0 22 62236 DM No. CD+31 2180 BD+31 2180 21 64711 DM No. BD+40 2872 BD+39 2872 21 74667 DM No. BD+28 255 BD+28 225 21 76943 DM No. BD+28 741 BD+28 742 21 4-3 Table 13. (continued) No. Field For Read S 76943 HD No. HD 32479 21 76944 DM No. BD+28 742 BD+28 741 21 76944 HD No. HD 32479 21 82706 DM No. CD+28 2193 BD+28 2193 21 85564 DM No. BD+29 3149a BD+29 3149 21 85567 DM No. BD+29 3149 BD+29 3149a 21 86043 DM No. CD+29 3259 BD+29 3259 21 94818 HD No. HD 247073 23 97434 RA 7h56m2.355s 7h56m4.172s 24 97434 PM (RA) +0.0021s/a +0.0302 s/a 24 107156 DM No. BD+13 4710 BD+13 4714 21 111240 DM No. BD+ 0 602 BD+ 0 603 21 114916 DM No. BD+ 1 1687 BD+ 1 1686 21 128522 DM No. BD- 0 5077 BD+ 0 5077 21 129898 DM No. BD- 0 361 BD- 0 361a 21 130238 PM (RA) 0.03s/a +0.019:s/a 25 130238 PM (DEC) 1.30"/a -0.08:"/a 25 131091 DM No. BD- 7 787 BD- 7 788 21 133461 Record Delete 23 142402 Record Delete 23 156969 HD No. HD 103314 21 156999 HD No. HD 103314 21 159442 DM No. CD-19 4188 BD-19 4188 21 159682 DM No. CD-19 4307 BD-19 4307 21 163131 DM No. BD-12 5991 BD-12 5591 21 163131 HD No. HD 204013 HD 188763 21 167662 DM No. CD-30 804 CD-29 804 21 172151 DM No. BD-20 1550 BD-21 1550 21 172631 Record Delete 23 172821 DM No. CD-28 3844 CD-28 3744 21 178737 DM No. BD-21 3161 BD-20 3161 21 178737 HD No. HD 93814 HD 89913 21 179258 DM No. BD-20 3161 BD-21 3161 21 179258 HD No. HD 89913 HD 93814 21 180619 Record Delete 23 181584 Record Delete 23 185579 DM No. CD-27 11769 CD-27 11768 21 186318 DM No. CD-23 13936 CD-23 13937 21 186419 DM No. CD-26 12900 CD-26 12898 21 186717 Record Delete 23 187331 DM No. BD-22 13325 CD-22 13325 21 190341 DM No. BD-22 15388 CD-22 15388 21 192236 DM No. CD-22 16507 CD-22 16508 21 193858 Record Delete 23 193896 Record Delete 23 4-4 Table 13. (concluded) No. Field For Read S 198195 DM No. BD-34 3755 CD-34 3755 23 201368 DM No. CD-37 6528B 21 204943 DM No. CD-31 10729 CD-31 10727 21 206001 DM No. CD-38 9673 CD-38 9693 21 208948 DM No. CD-36 11642 CD-36 11632 21 209763 DM No. CD-31 15539 CD-31 15149 21 209763 HD No. HD 165930 HD 165725 21 210778 DM No. CD-38 13224 CD-38 13239 21 211312 DM No. CD-36 13215 CD-37 13215 21 213279 DM No. CD-32 16734 21 215182 Record Delete 23 216710 DM No. BD-42 1425 CD-42 1425 21 220069 Spectrum B: Bp 22 222287 Record Delete 23 223213 DM No. CP-49 4828 CP-49 4827 21 226867 DM No. CD-45 10733 CD-45 10731 21 226867 GC No. GC 22215 21 226868 DM No. CP-45 8001C CP-45 8001 21 226868 GC No. GC 22215 21 227380 Record Delete 23 227535 DM No. CD-44 11300 CD-43 11300 21 228027 Record Delete 21 228306 Record Delete Keep 21 229059 Record Delete 23 232734 RA 2h20m50.218s 2h20m53.218s 24 234389 Record Delete 23 236668 Record Delete 23 238148 DM No. CP-53 3909 CP-53 3909B 26 238511 Record Delete 23 240305 Record Delete 23 241167 Record Delete 23 242605 Record Delete 23 242962 Record Delete 23 244399 HD No. HD 153772 HD 153771 26 244399 GC No. GC 22982 21 244400 HD No. HD 153772 26 244400 GC No. GC 22982 21 244725 DM No. CD-55 8100 CP-55 8100 21 246634 DM No. CP-51 10511 CP-51 11511 21 250957 Dec. -60d51'49.26" -60d31'49.26" 24 251166 DM No. CP-66 1447 CP-66 1453 21 251166 HD No. HD 94494 21 252071 DM No. CP-59 4544 21 252312 Spectrum B: Bp 22 256721 DM No. CP-73 746 CP-73 745 21 256935 DM No. CD-74 677 21 258552 DM No. CP-83 398 CP-80 398 21 4-5 All communications resulting in the changes in Table 13 are unpublished. For 13028, it is apparent that the proper motions are in error but accurate values are unavailable. In addition to the changes noted in Table 13, R. E. Reaves pointed out that plus signs were missing in bytes 27 and 60, that minus signs were occasionally found in byte 61, and that the seconds of arc field for the declinations sometimes read 60.00. These problems have been corrected. Table 14. Sources for Changes in the 1989 Version. Code Source 21 T. Lederle 22 R. E. Reaves 23 T. Lederle and ADC 24 T. Lederle and T. E. Corbin 25 H. Jahreiss and T. E. Corbin 26 ADC 4-6 Table 15. Changes to the SAO since the 1989 Version +--------------+-------------------+--------------+-------------+ | | | | | | SAO Number | Field | For | Read | | | | | | +--------------+-------------------+--------------+-------------+ | 15475 | DM Number | +66 717 | | | 19985 | DM Number | +61 2278 | +61 2277 | | 19985 | HD Number | | 211871 | | 27062 | Spec. Type | 5 | R5 | | 27100 | Spec. Type | 5 | R5 | | 31951 | Spec. Type | P | Pd | | 32162 | DM Number | +57 2104 | +57 2103 | | 32162 | HD Number | 239271 | | | 35236 | DM Number | +56 2966 | +56 2967 | | 35236 | HD Number | 219134 | | | 40312 | DM Number | +43 1261 | +43 1260 | | 40314 | DM Number | +43 1260 | +43 1261 | | 51472 | DM Number | +46 3506 | +46 3505 | | 52114 | DM Number | +48 3759 | +48 3757 | | 187331 | DM Catalog | CD | BD | | 190341 | DM Catalog | CD | BD | | 209822 | DM Number | 3512351 | 3512350 | | 211074 | DM Number | 3713108 | 3713109 | | 212391 | DM Number | 3018140 | 3018139 | | 212470 | Mu Dec. - J2000 | 0.003 | | | 215732 | DM Number | 43 611 | 43 612 | | 217573 | HD Number | | 39563 | | 219568 | DM Catalog | CP | CD | | 219568 | HD Number | 39563 | 68602 | | 227379 | HD Number | 152233 | | | 227380 | HD Number | | 152233 | | 227380 | Delete Code | D | | | 228306 | RA Sec at Epoch | 36.692 | 36.693 | | 232345 | DM Number | 51 312 | 51 311 | | 232345 | HD Number | 7456 | 7455 | | 232346 | DM Number | 51 311 | 51 312 | | 232346 | HD Number | 7455 | 7456 | | 234535 | Spec. Type | GO | G0 | | 239348 | DM Number | 58 3829 | 58 3823 | | 239348 | HD Number | 307183 | 102117 | | 244400 | Supp. Code | 1 | | | 244400 | HD Number | 537720 | 153772 | | 244400 | HD Code | 2 | 0 | | 244400 | GC Number | 29820 | 22982 | +--------------+-------------------+--------------+-------------+ 4 - 7 Table 16. Sources of Changes since 1989 other than DM Numbers +--------------+------------------------+-----------------------+ | | | | | SAO Number | Field | Source | | | | | +--------------+------------------------+-----------------------+ | 27062 | Spec. Type | Allan Moluf | | 27100 | Spec. Type | Allan Moluf | | 31951 | Spec. Type | ADC | | 56597 | Declination | Allan Moluf | | 75878 | Dec Sec at Epoch | William M. Owen | | 84129 | Magnitudes | William M. Owen | | 92548 | Magnitudes | David W. Dunham | | 97645 | HD Number | A. R. Peters | | 97646 | HD Number | A. R. Peters | | 143378 | J2000 Positions | Clayton A. Smith | | 187331 | DM Catalog | Carl Cole | | 190341 | DM Catalog | Carl Cole | | 194834 | Spec. Type | Allan Moluf | | 208759 | Mu Dec. - J2000 | Allan Moluf | | 208795 | Mu Dec. - J2000 | Allan Moluf | | 212470 | Mu Dec. - J2000 | Allan Moluf | | 217573 | HD Number | ADC | | 219568 | DM Catalog | ADC | | 219568 | HD Number | S. F. McLaughlin | | 227379 | HD Number | A. R. Peters | | 227380 | Delete Code | ADC | | 227380 | HD Number | A. R. Peters | | 228306 | RA Sec at Epoch | ADC | | 234535 | Spec. Type | Allan Moluf | | 244400 | Misalignment | Allan Moluf | +--------------+------------------------+-----------------------+ |NOTE: The magnitudes for 84129 and 92548 are from the SIMBAD | |data bank of the Centre de Donnees Astronomiques de Strasbourg.| +--------------+------------------------+-----------------------+ ACKNOWLEDGMENTS We wish to express our appreciation to N. J. Schofield Jr., who worked on an early phase of the SAO project in connection with the revised "SAO-HD-GC-DM Cross Index", and to D. Hoffleit, S. F. McLaughlin, R. E. Reaves, P. C. Schmidtke and W. L. Stein for communicating errors. We also thank the several people who pointed out additional errors, and T. E. Corbin for checking data for several stars in other catalogs and Mr. Rappaport for sending us the extensive list of possible problems in the DM numbers assigned in the SAO. We also thank those listed in Table 16 on page 4 - 7. for alerting us to other errors. Especially significant was the work of T. Lederle (Astronomisches Rechen-Institut, Heidelberg), who analyzed a large number of cross identifications for Durchmusterung stars, provided a large list of possible errors, and worked with us to improve the changes, which were then inserted into the 1989 version. 4 - 8 Finally, the new J2000 version of the catalog owes much to the work of C.A. Smith (U.S. Naval Observatory), who computed the J2000 positions and proper motions and added them to the data records. REFERENCES Argelander, F.W.A. 1859-1862, Bonner Sternverzeichniss, erste bis dritte Sektion, Astronomischen Beobachtungen auf der Sternwarte des Koeniglichen Rhein., Friedrich-Wilhelms-Universitaet zu Bonn, Baende 3-5. Aitken, R. G. 1932, New General Catalogue of Double Stars within 120 deg of the North Pole, Carnegie Institution of Washington Pub. 417 (Washington: Carnegie Institution of Washington). Barney, I., Hoffleit, D. and Jones, R. B. 1959a, Catalogue of the Positions and Proper Motions of 8380 Stars Between Declinations +50 and +55 degrees, reduced without applying Proper Motions to the Equinox 1950.0, Trans. Astron. Obs. Yale Univ. 26, Part II. Barney, I., Hoffleit, D. and Jones, R. 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Jr. 1983, Documentation for the Machine-Readable Version of the SAO-HD-GC-DM Cross Index, Version 1983, NSSDC/WDC-A 83-17. Schilt, J. and Hill, S. J. 1937, Photographic Magnitudes for 6,902 Stars in the Zone +55 to +60 degrees, Contr. Rutherfurd Obs., Columbia Univ., No. 30; 1938, Photographic Magnitudes of 7,280 Stars in the Zone +50 to +55 deg, Contr. Rutherfurd Obs., Columbia Univ., No. 31. Schoenfeld, E. 1886, Bonner Sternverzeichniss, vierte Sektion, Astronomische Beobachtungen auf der Sternwarte der Koeniglichen Rhein. Friedrich-Wilhelms- Universitaet zu Bonn 8, Part IV, Adolph Marcus, Bonn. Smithsonian Astrophysical Observatory Staff 1966, Star Catalog. Positions and Proper Motions of 258,997 Stars for the Epoch and Equinox of 1950.0, Pub. of the Smithsonian Institution of Washington, D.C. No. 4652 (Washington: Smithsonian Institution). Stoy, R H. 1968, Cape Photographic Catalogue for 1950.0. Zone -80 to -90 degrees, Ann. Cape Obs. 22. 4 - 10 Thome, J. 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