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NSSDC/WDC-A-R&S 81-03
DOCUMENTATION FOR THE MACHINE-READABLE VERSION
OF THE
MICHIGAN CATALOGUE OF TWO-DIMENSIONAL SPECTRAL TYPES FOR THE HD STARS
VOLUME 2: DECLINATIONS -53.0 to -40.0 DEGREES
(HOUK 1978)
Wayne H. Warren Jr.
April 1981
(Revision 1, February 1986)
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
MICHIGAN CATALOGUE OF TWO-DIMENSIONAL SPECTRAL TYPES FOR THE HD STARS
VOLUME 2: DECLINATIONS -53.0 TO -40.0 DEGREES
ABSTRACT
A detailed description of the machine-readable version of the catalog, as it
is currently being distributed from the Astronomical Data Center, is given.
This volume of the catalog contains all HD stars in the declination range -53
degrees up to and including -40 degrees (equinox 1900) and is part of a series
of catalogs in the University of Michigan program of systematic
reclassification in the MK system of the entire Henry Draper Catalogue (HD).
iii
TABLE OF CONTENTS
Section 1 - INTRODUCTION ............................................... 1-1
Section 2 - TAPE CONTENTS .............................................. 2-1
Section 3 - TAPE CHARACTERISTICS ....................................... 3-1
Section 4 - REMARKS AND MODIFICATIONS .................................. 4-1
Section 5 - SAMPLE LISTING * ........................................... 5-1
LIST OF TABLES
Table
1 Tape Contents ..................................................... 2-1
2 Tape Contents of Remarks File ..................................... 2-4
3 Tape Characteristics .............................................. 3-1
4 Plate Codes * ..................................................... 4-2
5 Description of Remarks ............................................ 4-4
* See ADC hardcopy documentation for these sections and tables.
v
SECTION 1 - INTRODUCTION
This document describes the magnetic tape version of Volume 2 of the
University of Michigan systematic reclassification program on the MK system
for the Henry Draper Catalogue (HD) stars. Volume 2 contains all HD stars in
the declination range -53.0 up to and including -40.0 degrees (equinox 1900).
The magnetic tape version of Volume 1 of the catalog (Houk and Cowley 1975),
containing HD stars in the zones -90.0 to -53.0 degrees, is described by Nagy
(1979).
The format of Volume 2 differs slightly from that of Volume 1 in the following
ways:
1. More accurate equatorial coordinates, as taken from a tape provided
by the Centre de Donnees Stellaires (CDS), Strasbourg, are included.
2. In addition to CPD (Gill and Kapteyn 1895-1900) designations (also
provided in Volume 1) CD (Thome 1892-1932) identifications are
given.
3. A new remarks code "D" is provided to indicate stars listed in the
CDS tape file as double, but not detected as double during
reclassification.
This document is intended to fully describe the tape version of this catalog
(Volume 2 only), to enable users to read and process the data records without
problems and guesswork. For additional details concerning the spectral
classification (standards, spectral qualities and averaging, notation,
classification criteria, and other miscellaneous items) the user should
consult the source reference. A copy of this document should, however, be
distributed with any machine-readable version of the catalog.
SOURCE REFERENCE
Houk, N. 1978, Michigan Catalogue of Two-Dimensional Spectral Types for the HD
Stars, Volume 2, Declinations -53.0 to -40.0 degrees (Ann Arbor: Department
of Astronomy, University of Michigan).
1-1
SECTION 2 - TAPE CONTENTS
A byte-by-byte description of the contents of the machine catalog is given in
Table 1. A suggested format specification is given in the final column, and
can be modified depending upon individual programming and processing require-
ments.
Table 1. Tape Contents. Michigan Catalogue of Two-Dimensional Spectral Types
for the HD Stars, Volume 2.
Suggested
Byte(s) Description Format
1- 6 HD Number I6
7 Blank or * (if spectral type contains lower case A1
letters in the printed version of the catalog)
8 Blank or + (if spectral type not classifiable and A1
taken from the HD Catalogue
9- 25 Spectral classification A17
26 Blank 1X
27 Blank or A (when classification used is an average; A1
quality used is then the highest of the qualities
used to form the average: blank when not an
averaged type)
28 Quality: I1
1 = spectrum near optimum exposure and not
overlapped with another spectrum
2 = spectrum may be slightly underexposed or
overexposed, or there may be slight
overlapping of two or more spectra
3 = spectrum quite overlapped by one or more
spectra, or noticeably underexposed
4 = badly overlapped spectra or underexposed
spectrum, but classification still probably
better than HD
29- 33 Remark (see Table 5 for description of remarks) A5
34 Blank 1X
2-1
Table 1. (continued)
Suggested
Byte(s) Description Format
35- 40 Magnitude, photographic from the HD Catalogue. A6
If no photographic magnitude is given in the
HD, this field contains 99.99. The decimal
point is contained in byte 38, but only one
significant digit is given (except for 99.99);
therefore, if the magnitude is read and printed
as F6.2, a zero will appear where a blank
should be printed. It is recommended that the
magnitude be read and printed in character
format unless calculations are to be performed
with it.
41 Blank or V (when the star is a known or suspected A1
variable and is not covered by an individual
entry in the remarks file).
42 Blank 1X
43- 52 Right Ascension (1900)
43 - 44 hours I2
45 blank 1X
46 - 47 minutes I2
48 blank 1X
49 - 52 seconds F4.1
53 Blank 1X
54- 62 Declination (1900)
54 - 56 degrees I3
57 blank 1X
58 - 59 arcminutes I2
60 blank 1X
61 - 62 arcseconds I2
63 Blank 1X
64- 72 Centennial precession in R.A.
64 - 67 minutes of time I4
68 blank 1X
69 - 72 seconds of time F4.1
73 Blank 1X
74- 79 Centennial precession in Dec.
74 - 76 arcminutes I3
77 blank 1X
78 - 79 arcseconds I2
2-2
Table 1 (concluded)
Suggested
Byte(s) Description Format
80 Blank 1X
81- 85 Galactic longitude (degrees) F5.1
86 Blank 1X
87- 91 Galactic latitude (degrees) F5.1
92 Blank 1X
93-101 CPD number (blank if none)
93 sign A1
94- 95 zone A2
96 blank 1X
97-101 number A5
102 Blank 1X
103-111 CD number (blank if none)
103 sign A1
104-105 zone A2
106 blank 1X
107-111 number A5
112 Blank 1X
113-115 Plate code #1 (each plate has an identification A3
code; Table 4 gives plate numbers and exposure
dates for the listed codes, while a digit in byte
113 indicates the number of plates used to
determine the average spectral type given)
116 Comma (,) A1 (1X)
117-119 Plate code #2 A3
120 Comma (,) A1 (1X)
121-123 Plate code #3 A3
124 Comma (,) A1 (1X)
125-127 Plate code #4 A3
2-3
Table 2. Tape Contents of Remarks File. Michigan Catalogue of Two-Dimensional
Spectral Types for the HD Stars, Volume 2
Suggested
Byte(s) Description Format
1- 6 HD number I6
7-400 Remarks--free form A394
2-4
SECTION 3 - TAPE CHARACTERISTICS
The information contained in Table 3 is sufficient to enable a user to read
the machine version of the catalog. Information for the entire catalog (both
files) is given in the table, but parameters which are easily varied from
installation to installation, such as blocksize (physical record length),
blocking factor (number of logical records per physical record), total number
of blocks, tape density, and coding (EBCDIC, ASCII) are not included: this
information should always be supplied if copies of the catalog are transmitted
to other users or installations.
Table 3. Tape Characteristics. Michigan Catalogue of Two-Dimensional Spectral
Types for the HD Stars, Volume 2.
NUMBER OF TRACKS . . . . . . . . . . . . . . . . . . . . . . . . 9
NUMBER OF FILES . . . . . . . . . . . . . . . . . . . . . . . . 2
LOGICAL RECORD LENGTH . . . . . . . . . . . . . . . . . . . . . 127,400
RECORD FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . FB*
NUMBER OF LOGICAL RECORDS . . . . . . . . . . . . . . . . . . . 30400,4950
* Fixed block length (last block may be short)
The numbers separated by commas refer to the first and second files of the
catalog, respectively. Logical record lengths are given in bytes
(characters).
3-1
SECTION 4 - REMARKS, MODIFICATIONS AND REFERENCES
A magnetic tape containing the catalog was received from the University of
Michigan in September 1978, along with a letter defining the format and
detailing differences from that of Volume 1 of the catalog, and some sample
copies of the preface to the printed version. Tables 4 and 5 of this
document, describing the plate codes and remarks, have been reproduced from
the preface for the convenience of users not having access to the printed
version; however, as mentioned in Section 1 of this document, users should
refer to the published catalog for more detailed information.
The following modifications have been made to the original tape records to
facilitate computer searching of the catalog for spectral temperature classes:
1. The * indicating lower case letters in spectral type (cf. byte 7,
Table 1) was originally in byte 8. It was moved to byte 7 (replacing a
blank) so that the + sign (cf. byte 8, Table 1), which was originally
contained in the first byte of the spectral-type field (byte 9) could be
moved to byte 8. This places the temperature class and subclass always in
bytes 9-10 for easier searching.
2. To simplify processing of the remarks file, originally supplied with
undefined record lengths, the file was converted at the Astronomical Data
Center to a fixed logical record length of 400 bytes.
REFERENCES
Gill, D. and Kapteyn, J. C. 1895-1900, Cape Photographic Durchmusterung, Ann.
Cape Obs. 3 (1895, Part I: zones -18 to -37); 4 (1897, Part II: zones
-38 to -52); 5 (1900, Part III: zones -53 to -89).
Houk, N. 1978, Michigan Catalogue of Two-Dimensional Spectral Types for the HD
Stars, Volume 2, Declinations -53.0 to -40.0 degrees (Ann Arbor: Department
of Astronomy, University of Michigan).
Houk, N. and Cowley, A. P. 1975, Michigan Catalogue of Two-Dimensional
Spectral Types for the HD Stars, Volume I, Declinations -90 to -53.0 degrees
(Ann Arbor: Department of Astronomy, University of Michigan).
Nagy, T. A. 1979, Documentation for the Machine-Readable Version of the
University of Michigan Catalogue of Two-Dimensional Spectral Types for the
HD Stars, System and Applied Sciences Corporation R-SAW-7/79-30.
Thome, J. M. 1892-1932, Cordoba Durchmusterung, Resultados del Observatorio
Nacional Argentino 16 (1892, Part I: -22 to -32), 17 (1894, Part II:
-32 to -42), 18 (1900, Part III: -42 to -52), 21 (Part I) (1914, Part
IV, -52 to -62), 21 (Part II) (1932, Part V: -62 to -90).
4-1
Table 5. Description of Remarks (1 of 4)
(Reproduced from the original published version of the catalogue)
Further information about 4950 stars is given in the back of the
catalogue. To aid the user in deciding whether to consult the remarks
for a particular star, the following notation is used in column 3 of the
catalogue [bytes 29-33 of machine-readable version]:
B indicates that the remark contains the HR (Bright Star Catalogue)
number and the Bayer or Flamsteed designations where applicable.
L indicates that information from the astronomical literature is
given. In most cases individual literature references are not
given: references systematically searched by A.P. Cowley are listed
at the end of this section. Remarks are generally restricted to
those relevant to the spectral appearance, such as rotation,
variability, and duplicity, and generally have included only
information about the star which might affect the spectral
classification.
O includes remarks that do not fit into any other category. Almost
all of these are NGC or IC designations for nebulae.
R Nearly half of the stars in the remarks table have remarks of this
type. All 'R' remarks were written by NH in the course of the
spectral classification and all are related in some way to the
spectrum. Most of the symbols and notation are self-explanatory,
but note that "yld." was used for yields and yield (followed by a
temperature or luminosity type) since an arrow or an implies sign
was not available. Note also that in quotations the close quote
sign is the same as the open quote sign, and hence faces the wrong
direction. We discuss some of the more frequent types of 'R'
remarks, in order of frequency of occurrence.
464 stars in the catalogue have composite spectra or possibly
composite spectra and each of these has a remark so that they can be
easily differentiated from known double stars which also sometimes
have two types listed in the catalogue.
In 318 cases the fact that the star was visually double was deduced
from the appearance of the spectrum (fuzzy, double-lined, or closely
overlapped) and the following data were listed (taken from Lick
Publ. 21, 1963, unless otherwise noted): position angle p, angular
distance d, and magnitudes of components. Sometimes a rough
spectral type for the secondary component is also listed in the
remarks, but often only a single type is listed in the catalogue,
and it may actually be an average of the two components in some
cases.
Remarks are made for all stars (approximately 150) showing emission
or filled-in lines, and the lines in emission are identified in the
4-4
Table 4-2. Description of Remarks (2 of 4)
(Reproduced from the original published version of the catalogue)
remark. For nebulae the lines in emission are often not listed.
The great majority of Am stars do not have remarks, but
approximately 100 do. Similarly some 125 of the Ap stars have 'R'
remarks. For both Am and Ap stars these are mainly weak or
questionable cases, and the spectral type listed in the catalogue
may not indicate the possible metallic-line or peculiar nature of
the star. Unusual and extremely strong cases are also included
among the remarks.
About 100 of the 'R' remarks pertain to fuzzy or closely overlapped
spectra some of which are probably new visual or spectroscopic
binaries.
Almost all of the approximately 55 weak-metal stars have 'R'
remarks. In many cases the spectral type indicated by the G band is
given to supplement the H-line and metallic-line types given in the
catalogue. Slight or questionable and extreme cases are also noted.
About 35 stars of widely different spectral types have 'R' remarks
because the various spectral line ratios indicate discrepant
temperature or luminosity types and it was not possible to arrive at
a consistent type. Some of these are certainly due to the composite
or closely double nature of the stars, while others reflect
abundance anomalies. Still others may be caused by overlapping
spectra or emulsion defects.
Other smaller categories of 'R' remarks include: approximately 15
substantial disagreements with the HD catalogue, mainly with respect
to spectral types; approximately 30 possible Fm Delta Del types;
approximately 45 stars with strong CH -- these are not indicated in
the catalogue spectral types.
D The Stellar Data Center at Strasbourg provided a listing of visual
double stars. Remarks beginning "undetected visual double" were
included for doubles not discovered in the course of the spectral
classification, the others having 'R' remarks. 'D' remarks were
included for the 1874 doubles having a separation less than or equal
to 30 arcseconds and a differential magnitude less than 4.0 mag,
since for these the spectral appearance and hence the assigned
spectral type might be affected. No 'R' remarks were changed, so
note that some spurious "Am" and "weak-lined" remarks remain.
V All variables and suspected variables are indicated by a 'V' after
the magnitude. Each has a remark in the back of the catalogue
giving variable star designation, type of variability, magnitude
range, and period, when these are known.
4-5
Table 4-2. Description of Remarks (3 of 4)
(Reproduced from the original published version of the catalogue)
t [Actually a dagger symbol in the hardcopy text. -- ed.] All spectral
types in the catalogue taken from other sources are preceded with a
dagger. Each such star has a remark giving the reason the star
could not be classified on Michigan plates and the source of the
classification. All but 120 were taken from the HD catalogue. In
the case of types taken from the catalogues by Jaschek et al.
(1964) and by Kennedy and Buscombe (1974) the above are quoted
rather than the original reference in these catalogues. MK types
for stars brighter than 4.75 magnitudes not included in the paper by
Hiltner, Garrison, and Schild referenced below have been kindly
provided by R. F. Garrison prior to publication. Although the types
are preliminary, they are on a more homogeneous system than any
others available. References marked with a dagger below were used
as sources for spectral types. Stars which were too faint to
classify on Michigan plates were not searched for in dagger
references, since chances of them being found were small. Instead
the HD type was given.
References
L = reference for 'L' remarks
V = reference for 'V' remarks
t = reference for 't' [dagger] remarks
L Aller, M. F., Elste, G., and Williams, J. A. 1970, "Michigan
Abundance Catalogue", unpublished.
L Babcock, H. W. 1958, "A Catalogue of Magnetic Stars", Ap. J.
Suppl., 3, 141.
L Batten, A. H. 1967, "Sixth Catalogue of the Orbital Elements of
Spectroscopic Binary Systems", Pub. D.A.O., 13, 119.
L Bernacca, P. L. and Perinotto, M. 1970, "A Catalogue of Stellar
Rotational Velocities", Cont. Obs. Astro., Padova, No. 239.
VL Bidelman, W. P. 1954, "Catalogue and Bibliography of Emission-Line
Stars of Types Later than B", Ap. J. Suppl., 1, 175.
tL Cannon, A. J. and Pickering, E. C. 1918-24, "The Henry Draper
Catalogue", Harvard Annals, 91-99.
t Hiltner, W. A., Garrison, R. F. and Schild, R. E. 1969, Ap. J., 157
313.
L Hoffleit, D. 1964, Catalogue of Bright Stars, (New Haven: Yale
University Observatory).
4-6
Table 4-2. Description of Remarks (4 of 4)
(Reproduced from the original published version of the catalogue)
t Jaschek, C., Conde, H., and Sierra, A. C. 1964, "Catalogue of
Stellar Spectra Classified in the Morgan-Keenan System", Series
Astronomica, 28, Obs. Astron., U. Nac. La Plata.
L Jaschek, C., Ferrer, L., and Jaschek, M. 1971, "Catalogue and
Bibliography of B type Emission Line Stars", Series Astronomica,
28, Obs. Astron., U. Nac. La Plata.
t Kennedy, P. M. and Buscombe, W. 1974, MK Spectral Classifications,
(Evanston: Department of Astronomy, Northwestern University).
V Kukarkin, B. V. et al. 1965, Second Catalogue of Suspected Variable
Stars, (Moscow: Sternberg State Astronomical Institute).
V Kukarkin, B. V. et al. 1969, General Catalogue of Variable Stars,
3rd Ed., (Moscow: Sternberg State Astronomical Institute).
L Luyten, W. J. 1955, "A Catalogue of 1849 Stars with Proper Motions
Exceeding 0.5" Annually", Lund Press.
L Pedoussant, A., and Ginestet, N. 1971, "Spectroscopic Binaries --
11th Complementary Catalogue", Astr. and Ap. Suppl., 4, 253.
L Uesugi, A. and Fukuda, I. 1970, "A Catalog of Rotational Velocities
of the Stars", Contr. Inst. Ap. and Kwasan Obs., Kyoto, No. 189.
L Wackerling, L. R. 1970, "Catalogue of Early-Type Stars Whose Spectra
Have Shown Emission Lines", Mem. R.A.S., 73, 153.
4-7