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NSSDC/WDC-A-R&S 84-18 DOCUMENTATION FOR THE MACHINE-READABLE VERSION OF THE HENRY DRAPER CATALOGUE (EDITION 1985) Nancy G. Roman and Wayne H. Warren Jr. February 1985 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 DOCUMENTATION FOR THE MACHINE-READABLE VERSION OF THE HENRY DRAPER CATALOGUE (EDITION 1985) 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 Published and unpublished errors discovered in the previous version have been corrected; letters indicating supplemental stars in the BD have been moved to a new byte to distinguish them from double-star components; and the machine-readable portion of The Henry Draper Extension (HDE) (HA 100) has been converted to the same format as the main catalog, with additional data added as necessary. ii TABLE OF CONTENTS Section 1 - INTRODUCTION AND SOURCE REFERENCES ...................... 1- 1 Section 2 - FILE CONTENTS ........................................... 2- 1 Section 3 - FILE CHARACTERISTICS .................................... 3- 1 Section 4 - REMARKS, MODIFICATIONS, ACKNOWLEDGMENTS AND REFERENCES .. 4- 1 LIST OF TABLES Table 1 File Contents .................................................. 2- 1 2 File Characteristics ........................................... 3- 1 3 Explanatory Notes to Individual Changes ........................ 4- 3 4 *Changes from the Original Machine Version ...................... 4- 4 5 Stars Deleted from the Catalog ................................. 4- 3 6 *Records Now Out of Right Ascension Order ....................... 4-15 7 Additional Errors Still Present in This Machine Version ........ 4-16 [See the ADC hardcopy documentation for these tables, ed.] iii SECTION 1 - INTRODUCTION AND SOURCE REFERENCES Early in this century, Miss Cannon undertook to classify all stars to the faintest possible magnitude limits on the objective-prism plates available to her. Although the faint limit varies from plate to plate and the southern plates were superior to the northern ones (Hoffleit 1985, private communication) a realistic value appears to be approximately m(pg) = 9. The resulting spectral types were published in The Henry Draper Catalogue (HD, Cannon and Pickering 1918-1924). Later, she classified somewhat fainter stars in a number of regions of the sky. This work was completed by Mrs. Mayall and published as "The Henry Draper Extension" (HDE, Cannon 1925-1936; Cannon and Walton Mayall 1949). A machine version of the HD and of the first volume of HDE was originally prepared under the supervision of D. Hoffleit at the Yale University Observatory some years ago (Hoffleit 1967; Gottlieb and Hoffleit 1969), and was subsequently updated with known errors (including some in the printed catalog) at the Astronomical Data Center (ADC) in 1976. The current version of the HD contains the corrections for all errata known to us and/or published up to the date of this version (February 1985), various errors forwarded to us by colleagues, and errors discovered at the ADC during the course of this work. In addition, the regions of the HDE (1925-1936) for the declination zones +50 to +59 degrees and for the Magellanic Clouds have been changed to the same format as the basic catalog. Right ascensions and declinations have replaced the X,Y coordinates in the Magellanic-Cloud region. This version of the machine-readable HD/HDE does not contain the last volume of the HDE (1949) because no positions are currently available in machine form for stars in the range HDE 272151-359083. This machine version of the HD catalog has intentionally been prepared to conform as closely as possible to the original published catalog, i.e., the data have not been updated with more modern positions, magnitudes, or spectral types, since those data can be found in other machine-readable catalogs. The intent was to prepare and archive the catalog in essentially original form, except for the correction of major errors and the identification of duplicate entries (where the same star has been assigned more than one HD number). For ease of use and to make possible the addition of numbers from the Cape Photographic Durchmusterung in the zones -18 to -52 degrees and the Cordoba Durchmusterung in the zones -53 to -89 degrees when no other DM numbers exist (not allowed for in the original HD, nor in the previous machine catalog) the Durchmusterung numbers have been expanded to their full representation and the correct prefixes added (BD, CD, CP); thus, codes for DM numbers in italics have been removed and the correct zones inserted. This document describes the new version of the machine-readable Henry Draper Catalogue. It outlines the procedures used to correct and extend the previous version; it is intended to enable users to read and process the data without problems and guesswork. For more detailed descriptions of the history of the HD, the Harvard spectral classification system, and other data contained in the original published catalog, the source references and their bibliographies (given in the texts only) should be consulted. A copy of this document should accompany any machine version of the catalog originating from the Astronomical Data Center. 1-1 SOURCE REFERENCES Cannon, A.J. 1925-1936, The Henry Draper Extension, Ann. Astron. Obs. Harvard College 100. Cannon, A. J. and Pickering, E. C. 1918-1924, The Henry Draper Catalogue, Ann. Astron. Obs. Harvard College 91-99. 1-2 SECTION 2 - FILE CONTENTS A byte-by-byte description of the contents of the machine-readable Henry Draper Catalogue is given in Table 1. A suggested Fortran 77-type format specification for reading each data field is included, but these can be modified depending upon individual programming and processing requirements. Data are present for all stars in the catalog, including some which have been effectively deleted because they are duplicate entries. These have been flagged by a "D" in byte 46 and are listed in Table 5, but the records and data have been left in the machine version in order not to change the star counts and numerical sequencing, so that stars appear in their correct locations if the catalog is sorted by declination, so that data can be retrieved for those stars if the HD numbers have been used elsewhere in the literature or in other catalogs, and in the event that it is decided at a later time that a wrong star has been suppressed. Although there are not many of these stars, the user should check byte 46 before using the HD numbers or data in other compilations or in publications, and before using the data to prepare finding charts, etc. All data fields having primary A-format specifications are blank for missing data, so the alternate numerical formats used for machine searches will produce zero values. Data are always present in fields for which primary numerical format specifications are given, except for magnitude data, where the fields are left blank if no values are present in the published catalog (see the tabular descriptions for bytes 30-34 and 36-39). The data file is ordered strictly by HD number, although in certain cases, stars are now not in right ascension order (see Table 6) because of corrections made to their equatorial coordinates. Table 1. File Contents. The Henry Draper Catalogue (Machine Version 1985). Suggested Byte(s) Units Format Description 1-6 --- I6 HD number. 7-8 --- A2 Durchmusterung (DM) identification (BD, CD, CP) or the letters "AG" (see below). 9 --- A1 Sign of DM zone. 10-11 --- A2 (I2) DM zone. For AG stars (zones +50 to +59) not in the BD, bytes 7-8 read "AG" and bytes 10-11 give the lowest declination zone in the appropriate AG catalog (50 or 55). 12-16 --- A5 (I5) DM or AG number. 2-1 Table 1 (continued) Suggested Byte(s) Units Format Description 17 --- A1 Component identification if there are two or more HD stars with the same DM number. For multiple systems included in the Washington Catalog of Visual Double Stars (WDS, Worley 1984) the same designations are given. 18 --- A1 Lower case letter identification for BD supplemental stars (Warren and Kress 1980). 19-20 hours I2 Right ascension equinox 1900. 21-23 min F3.1 R.A. 24 --- A1 Sign of declination equinox 1900. 25-26 deg I2 Dec. 27-28 arcmin I2 Dec. 29 --- I1 Photovisual magnitude code: 0 measured value 1 value inferred from m(pg) and spectral type 30-34 mag F5.2 Photovisual magnitude, m(v), except for the following codes for ficticious magnitudes: 20.0 nebula (Neb in published catalog) 30.0 variable (var. in published catalog) 40.0 nova (Nov. in published catalog) 50.0 cluster (Cl. in published catalog) blank no value in published catalog 35 --- A1 "C" denotes that m(v) is the combined value for this and the following or preceding entry. 36 --- I1 Photographic magnitude code (see byte 29). 37-41 mag F5.2 Photographic magnitude, m(pg) (see bytes 30-34) 42 --- A1 "C" denotes that m(pg) is a combined value for this and the following or preceding entry. 43-45 --- A3 Spectral type. Contains upper and lower case characters as in published catalog. 2-2 Table 1 (concluded) Suggested Byte(s) Units Format Description 46-47 --- A2 (I2) Photographic intensity of the spectrum esti- mated by Miss Cannon. The faintest spectra which could be classified with certainty were assigned a value of 1, while the densest are given as 10. For stars having two intensities in the published catalog, only the first is given in the machine version. 48 --- A1 Remarks. The following codes are used: D Entry deleted because it is a duplicate or does not refer to a real star (see Table 4) E Image is at edge of plate G Position and BD number taken directly from AGK and precessed to 1900 M Multiple images used. Only one intensity is included (both are in the published catalog, however) R There is a remark for this star in the published catalog * Spectral type refers to a cluster, nebula or nebulous star. (Occurs in the Magel- lanic-Cloud fields only.) 2-3 SECTION 3 - FILE CHARACTERISTICS The information in Table 2 is sufficient for a user to describe the indigenous characteristics of the machine-readable Henry Draper Catalogue 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 2. File Characteristics. The Henry Draper Catalogue (Machine Version 1985). NUMBER OF FILES ................................................ 1 LOGICAL RECORD LENGTH (BYTES) .................................. 48 RECORD FORMAT .................................................. Fixed TOTAL NUMBER OF LOGICAL RECORDS ................................ 272150 3-1 SECTION 4 - REMARKS, MODIFICATIONS, ACKNOWLEDGMENTS AND REFERENCES The original machine-readable Henry Draper Catalogue was obtained on magnetic tape from the U. S. Naval Observatory in the mid 1970's. Although some corrections were incorporated into the tape version at the ADC in 1976, no major revision to the format (as described below) had been made prior to this version. The changes described here were made to improve the quality of the machine version and to make the catalog generally easier to use. This is especially significant in the case of the AG zones, where no positions are given in the published version, and in the Magellanic-Cloud regions where only X and Y rectangular coordinates were reported. Two sections of The Henry Draper Extension (HDE, Cannon 1924-1936) which include stars between +50 and +55 degrees and between +55 and +60 degrees (HDE 232101-240500) identify stars only by their AG numbers. For the stars in the Yale Zone Catalogues for these zones (Barney et al. 1959), BD numbers and positions were extracted from those catalogs and the positions precessed to 1900. For the relatively few stars not in the Yale catalogs, these data were obtained directly from the Astronomische Gesellschaft Katalog (AGK, Kruger 1890; Rogers 1892). AG numbers are given only for those stars with no BD numbers. For most of the stars in the Magellanic Clouds (HDE 268601-270500) only X,Y coordinates are given in the HDE. However, CP numbers are included for 133 stars. The CP identifications were used to locate these stars in the Yale Zone Catalogues for -60 to -70 degrees (Fallon 1983) and -70 to -90 degrees (Lu 1971). The positions in the latter catalogs were used in a least squares solution to obtain the transformation from X,Y to equatorial coordinates. This transformation was then applied to all stars in this section of the catalog to obtain the right ascensions and declinations. (The X,Y coordinates are not included.) These modifications effected a uniform format for the entire catalog, as well as making the AG and MC sections more readily usable. All letters which are lower case in the printed version of the HD can be read as lower case letters here. Missing data are blank in the corresponding records, but numerical codes are retained in the magnitude bytes for nebulae, novae, clusters, and variable stars so that these may continue to be read with an F format. Double-star-component identifications were changed to agree with the component identifications in the Washington Catalog of Visual Double Stars (WDS, Worley 1984 update of Jeffers et al. 1963 Index Catalogue of Visual Double Stars); for stars not in the WDS, components were labeled according to visual magnitude. For pairs not in the IDS with identical or combined magnitudes, the designation denoting the western component as "A" was retained. Supplemental (footnoted) BD stars (Warren and Kress 1980) are denoted by lower case letters in a byte separate from that used for double-star components. For AG stars not included in the BD, the lowest declination for the AG zone and the AG number are given. Uncertain spectral types have been designated by a colon in byte 43 instead of by "Q" as in the previous version. The DM numbers are now given in their full representation, including the catalog designation. This eliminates the difficulty experienced in the printed version for stars not contained in the proper catalogs for their declinations, as well as the need to indicate stars which changed declination zones between 1855 or 1875 and 1900. 4-1 The previous machine version contained the serious problem of the HDE stars 231301 to 240500 being shown as having m(pg) data, whereas they are in fact, unlike the rest of the HDE, m(v) data. They have therefore been moved to the m(v) field in the new version. Plus signs (byte 24) for all positive declinations have been added in this version. Errata were checked as thoroughly as possible and appropriate corrections entered into the catalog. The positions, magnitudes, and spectral types were then compared approximately with the values given for each HD star in the Strasbourg Catalog of Stellar Identifications (CSI, Ochsenbein et al. 1981). DM numbers were compared with those in both the CSI and the new SAO-HD-GC-DM Cross Index (Roman et al. 1983). All discrepancies were checked and corrections made as necessary. A version of the HD sorted by DM number was checked for duplicate entries and component identifications were added as described above. This check also uncovered a number of errors, including the omission of many supplemental BD designations. Changes to the original machine version of The Henry Draper Catalogue are listed in Table 4. The column "S" denotes the source of a change by the following code: 1 - Hoffleit 1976 2 - ADC 1976 (included in a previous machine version; these corrections were carefully tabulated and a typed list prepared, but they were not published. Published errata included in the tabulation were lists by Jung and Bischoff 1971 and the Hoffleit 1976 list which has subsequently been separated to become Source 1. Some corrections in the former lists were further corrected in the latter) 3 - S. F. McLaughlin, private communication 4 - ADC 1985 (changes made since 1976) Notes on changes for individual stars are given in Table 4. Stars which should be deleted, together with the number of the duplicate entry which should be retained, if any, are listed in Table 5. As a result of changes in the right ascensions of a few stars, their entries are now out of time order. These stars are listed in Table 6. After the new machine catalog and listing of changes had been prepared, several additional errors were found. These errors are given in Table 7; the changes for HD 45075, 58881 and 61898 were discovered by E. D. Hoffleit in the course of reviewing this document. The remaining ones were detected at the ADC while working on other catalogs. The errors in Table 7 will be corrected in some future version of the machine catalog. 4-2 Table 3. Explanatory Notes to Individual Changes. HD Remarks 45075 Hoffleit (1976) states that the position given refers to CD-38 2619, whereas the spectral type refers to -38 2621. The positions have been changed to those for -38 2621. 55363 This star is identified as -0 1641 in the HD, but in the second HDE (Cannon and Walton Mayall 1949) the star numbered HD 55363, spectral type A2, is -0 1642. W. Stein recommended changing the identification in the SAO to -0 1641. It seems likely that the HD star is the nor- thern, slightly fainter star of the pair, or -0 1641. The SAO star may or may not be the HD star. 61898 Hoffleit (1976) states that the position given refers to CD-36 3788, whereas the spectral type refers to -36 3787. The declination has been changed to that for -36 3787. 89880 The printed catalog lists this star at declination -79 45 with the DM number in italics (i.e., referring to the adjacent declination zone). The star appears to be CP-78 536 at declination -78 45. 168235 According to Hoffleit (1976), the magnitudes and position correspond to CD-32 14019, whereas the spectral type refers to -32 14027. The DM number, magnitudes, and positions have been changed to those for -32 14027. Table 5. Stars Deleted from the Catalog. Delete Retain 62122 206487 82990 82967 87124 87107 91169 109005 93428 93470 132017 131999 164863 164883 217507 217490 240507 240515 240750 240762 243090 252214 41909 266439 266474 4-3 Table 7. Additional Errors Still Present in This Machine Version. HD Item For Read 45075 DEC -38 16 -38 14 58881 SPEC Rp S 61898 DEC -36 52 -36 56 173607 DM 3510A 3510C 173608 DM 3510B 3510D 192604 DM 4031A 4031 a 4-16 ACKNOWLEDGMENTS We express our appreciation to Dr. E. Dorrit Hoffleit and Mrs. Margaret Walton Mayall for their help in clarifying certain aspects of The Henry Draper Catalogue. Dr. Hoffleit kindly reviewed a preliminary copy of this document, made extensive comments and suggestions, pointed out additional errors, and applied her many years of experience toward passing judgment upon it. REFERENCES Barney, I., Hoffleit, D. and Jones, R. B. 1959a, Catalogue of the Positions and Proper Motions of 8380 Stars Between Declinations +50 and +55, 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. B. 1959b, Catalogue of the Positions and Proper Motions of 8164 Stars Between Declinations +55 and +60, reduced without applying Proper Motions to the Equinox 1950.0, Trans. Astron. Obs. Yale Univ. 27. Cannon, A.J. 1925-1936, The Henry Draper Extension, Ann. Astron. Obs. Harvard College 100. Cannon, A. J. and Pickering, E. C. 1918-1924, The Henry Draper Catalogue, Ann. Astron. Obs. Harvard College 91-99. Cannon, A. J. and Walton Mayall, M. 1949, The Henry Draper Extension, The Annie J. Cannon Memorial Volume, Ann. Astron. Obs. Harvard College 112. Fallon, F. W. 1983, Catalogue of the Positions and Proper Motions of Stars Between Declinations -60 and -70. Trans. Astron. Obs. Yale Univ. 32, Part II. Gottl[ie]b, D. and Hoffleit, D. 1969, Bull. Amer. Astron. Soc. 1, 373. Hoffleit, D. 1967, Astron. J. 72, 586. Hoffleit, D. 1976, Errors in The Henry Draper Catalogue, Bull. Inf. Centre Donnees Stellaires No. 10, p. 2. Hoffleit, D. 1977, Errata to the Errata to The Henry Draper Catalog[ue], Bull. Inf. Centre Donnees Stellaires No. 12, p. 44. Jeffers, H. M., van den Bos, W. H. and Greeby, F. M. 1963, Index Catalogue of Visual Double Stars, 1961.0, Pub. Lick Obs. 21. Jung, J. and Bischoff, M. 1971, Errors Found in the Published Version of the H.D. Catalogue, Bull. Inf. Centre Donnees Stellaires No. 2, p. 18 (and Addenda by Bischoff in No. 3, p. 23). 4-17 REFERENCES (concluded) Kruger, A. 1890, Zonenbeobachtungen der Sterne zwischen 55 and 65 nord. Dekl. angestellt an der Sternwarten von Helsingfors und Gotha. I Band, Enhalt d. Zonen 1-338 nebst den mittleren Oertern der Sterne fur 1875 (Helsingfors: Kaiserl. Alexanders-Universitat). Lu, P. K. 1971, Preliminary Catalogue of the Positions and Proper Motions of Stars Between Declinations -70 and -90, Trans. Astron. Obs. Yale Univ. 31. Ochsenbein, F., Bischoff, M. and Egret, D. 1981, Astron. Astrophys. Suppl. 43, 259. Rogers, W. A. 1892, Catalogue of 8627 Stars between +49 50 and +55 10 of North Declination in 1855.0, Ann. Astron. Obs. Harvard College 15, Part II (Cambridge AG). Roman, N. G., Warren, W. H. Jr. and Schofield, N. J. 1983, Documentation for the Machine-Readable Version of the SAO-HD-GC-DM Cross Index (Version 1983) NSSDC/WDC-A-R&S 83-17. Warren, W. H. Jr. and Kress, K. 1980, Astron. Data Center Bull. 1, 19. Worley, C. E. 1984, Washington Catalog of Visual Double Stars 1984.0 (magnetic tape version) (Washington: U. S. Naval Observatory). 4-18