SSD-T-1-5069-0060-83 DOCUMENTATION FOR THE MACHINE-READABLE VERSION OF THE UNIVERSITY OF MICHIGAN CATALOGUE OF TWO-DIMENSIONAL SPECTRAL TYPES FOR THE HD STARS, VOLUME 3 (HOUK 1982) January 1983 Contract NAS 5-26490 Robert S. Hill Prepared for: National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt, Maryland 20771 Prepared by: ST Systems Corporation 4400 Forbes Boulevard Lanham, Maryland 20706 SECTION 1 - INTRODUCTION ------------------------ A COPY OF THIS DOCUMENT SHOULD ACCOMPANY EVERY DISTRIBUTED COPY OF THE MACHINE-READABLE CATALOGUE. This document describes a machine-readable version of Volume 3 of the "University of Michigan Catalogue of Spectral Types for the HD Stars" (Houk 1982). This volume covers all the HD stars from declination -40 degrees to declination -26 degrees (1900 coordinates). The only difference in form between this volume and Volume 2 is that Smithsonian Astrophysical Observatory (SAO) Catalogue numbers are given instead of Cape Photographic Durchmusterung (CPD) numbers. The references for the documentation of the machine-readable versions of Volumes 1 and 2 are given below. Most of the material in this document is derived from the prefatory sections of Houk (1982) and in fact Tables 4-1 and 4-2 are taken from there directly. REFERENCES: Houk. N. "Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars", Volume 3, Ann Arbor, Department of Astronomy, University of Michigan, 1982. Nagy, T. A. "Documentation for the Machine-Readable Version of the University of Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars, Volume 1", SASC Document R-SAW-7/79-30. Warren, W. H. Jr. "Documentation for the Machine-Readable Version of the University of Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars, Volume 2", NSSDC Document NSSDC/WDC-A-R&S 81-03. 1-1 SECTION 2 - TAPE CONTENTS ------------------------- A byte-by-byte description of the contents of the catalogue is given in Table 2-1 and Table 2-2. The information in the "Description" column is derived mainly from the published version of the catalogue whenever possible. The "Suggested Format" column is for FORTRAN-formatted reads. 2-1 Table 2-1. Tape Contents (1 of 4) Michigan Catalogue of Two-Dimensional Spectral Types For the HD Stars (Volume 3) Data File Suggested Bytes Description Format ----- ----------- --------- 1- 6 Henry Draper (HD) number. This catalogue I6 contains all the 30314 HD stars between -40.0 degrees and -26.0 degrees declination (epoch 1900). The HD numbers in this file are in increasing order, but are not consecutive. 7 '*' if the spectral type in the printed version A1 of the catalogue contains lower-case letters. Otherwise blank. 8 '+' if the spectrum was not classifiable, in A1 which case the original HD spectrum is retained. Otherwise blank. Six hundred and sixty-four records have the '+'. Of these, all have blank plate codes (bytes 113-127), except for HD 409. 9- 26 Spectral type. The stars were classified 18A1 visually by N. Houk on objective-prism plates, taken at a dispersion of 108 A/mm (at H-gamma), with a resolution of about 2 A/mm. 27 'A' if the spectral classification is an average. A1 Otherwise blank. 28 Quality of the spectral type. If the type is an I1 average (see byte 27), the quality is taken to be the best among the averaged spectra. If at least one superior spectrum (quality 1 or 2) was avail- able, then any inferior spectra (quality 3 or 4) were left out of consideration altogether. Houk recommends the restriction of statistical studies to spectra of quality 1 or 2 "when possible". The quality ratings are defined as follows: 1 Near-optimum exposure, unoverlapped by other spectra. 2-2 Table 2-1. Tape Contents (2 of 4) Michigan Catalogue of Two-Dimensional Spectral Types For the HD Stars (Volume 3) Data File Suggested Bytes Description Format ----- ----------- --------- 2 Slightly over- or underexposed, or slightly overlapped. 3 Quite overlapped or underexposed. 4 Worse than 3, "though still probably better than the HD type". 29- 32 Remark (see Table 4-2). This is a code 4A1 describing the nature of the remark (if any) for this star in the second file of this catalogue (see Table 2-2). 33- 35 Blank 3X 36- 40 Photographic magnitude from the HD catalogue. F5.2 If no photographic magnitude is given in the HD, '99.99' is given here. The vast majority of the magnitudes are only given to a precision of one decimal place; only those with a non-zero hundredths digit are given to two places. 41 'V' if the star is known or suspected variable; A1 in this case a remark is given in the second file of the catalogue (see Table 2-2). Otherwise blank. 42 Blank 1X 43- 53 Right ascension (1900). 43-44 Hours I2 45 Blank 1X 46-47 Minutes I2 48 Blank 1X 49-52 Seconds F4.1 53 '*' if the right ascension is given A1 2-3 Table 2-1. Tape Contents (3 of 4) Michigan Catalogue of Two-Dimensional Spectral Types For the HD Stars (Volume 3) Data File Suggested Bytes Description Format ----- ----------- --------- to 0.1 minute in the published version. Otherwise blank. 54- 62 Declination (1900). 54 Sign; always '-' A1 55-56 Degrees I2 57 Blank 1X 58-59 Arcminutes I2 60 Blank 1X 61-62 Arcseconds. If byte 53 is '*', I2 these bytes may be blank. 63- 66 Blank 4X 67- 73 Centennial precession in right ascension. 67 Minutes I1 68 Blank 1X 69-72 Seconds F4.1 73 '*' if the precession in right A1 ascension is given to 0.1 minute in the published catalogue. Otherwise blank. 74- 79 Centennial precession in declination. 74 Sign: '-' or blank A1 75-76 Arcminutes I2 77 Blank 1X 78-79 Arcseconds I2 80 Blank 1X 81- 85 Galactic longitude (degrees). F5.1 86 Blank 1X 2-4 Table 2-1. Tape Contents (4 of 4) Michigan Catalogue of Two-Dimensional Spectral Types For the HD Stars (Volume 3) Data File Suggested Bytes Description Format ----- ----------- --------- 87- 91 Galactic latitude (degrees). F5.1 92 Blank 1X 93-101 Cordoba Durchmusterung number (blank if none). 93- 95 Zone I3 96 Blank 1X 97-101 Number within zone I5 102-105 Blank 4X 106-111 Smithsonian Astrophysical Observatory (SAO) I6 Catalogue number. 112 Blank 1X 113-127 Plate codes. These are described in Table 4-1 of the hardcopy document. A comma (byte 116, 120, or 124) is present only if a plate code follows. More than one plate code in this column indicates an averaged spectrum, also noted in byte 27 (see above). Therefore, the number of spectra averaged for a given star can be obtained by counting the non-blank plate codes. 113-115 Plate code or blank. This plate A3 code and therefore the other three are blank in 664 cases, of which 663 have a '+' in byte 8 (see above). The odd case is HD 163982. 116 Comma or blank A1 117-119 Plate code or blank A3 120 Comma or blank A1 121-123 Plate code or blank A3 124 Comma or blank A1 125-127 Plate code or blank A3 2-5 Table 2-2. Tape Contents Michigan Catalogue of Two-Dimensional Spectral Types For the HD Stars (Volume 3) Remarks File Suggested Bytes Description Format ----- ----------- --------- 1- 6 HD number I6 7 Blank 1X 8-255 Remark, free format 248A1 2-6 SECTION 3 - TAPE CHARACTERISTICS -------------------------------- The information in this section describes the logical structure of the catalogue file or files. (Multiple values for an entry describe the separate files of a multi-file catalogue.) A reminder to the user is included of the PHYSICAL tape attributes of which knowledge may be required to read the tape. 3-1 Table 3-1. Tape Characteristics Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars (Volume 3) Data and Remarks Files Catalogue Abbreviation MHD3 Number of Files 2 Logical Record Length (Bytes) 127, 255 Record Format (IBM OS/JCL) FB, FB Total Number of Logical Records 30314, 4837 Other attributes of the tape will vary from copy to copy, as their values are discretionary, or else depend on the computer for which the tape was copied. These include the following: Number of Tracks Density (Bits per Inch) Blocksize (Bytes) Blocking Factor (= Number of Logical Records per Block*) Total Number of Blocks Character Code The values of these parameters for your tape are supplied separately. You may wish to write them in above. * For record format FB, this is simply blocksize divided by logical record length. Also for record format FB, the last block may be truncated. 3-2 SECTION 4 - REMARKS AND MODIFICATIONS ------------------------------------- A magnetic tape version of this catalogue was received by the Astronomical Data Center (NASA/GSFC) from N. Houk in November, 1982. The following changes were made: (1) The asterisk denoting small letters in the spectral type was moved from byte 8 to byte 7. (2) Spectral types beginning with a plus sign were moved from byte 9 to byte 8 so that the first dimension of the spectral type is always in byte 9. (3) 99.99 was substituted for asterisks in the magnitude. (4) In the centennial precession in declination, the minus sign was adjusted to appear always in byte 74. (5) In the records for HD 151639, 202560, and 225213, right ascensions were given in a format unlike the rest of the file because they were less precise. These quantities were put into the same format as the rest of the file, and the lesser precision denoted with asterisks. (6) In the case of the last 63 records in the file (HD number 224747 and after), the centennial precession was incorrect, probably arising from an error in precessing from slightly less than 24 hours to slightly greater than 0 hours. These precessions were recalculated. (7) The remarks file records were padded with blanks to a fixed length. Of these changes, only (6) involves the actual catalogue data. The rest were made primarily for uniformity with the machine-readable version of Volume 2, but also to facilitate the use of the catalogue with FORTRAN programs. REFERENCES: Houk, N. "Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars", Volume 3, Ann Arbor, Department of Astronomy, University of Michigan, 1982. 4-1 Nagy, T. A. "Documentation for the Machine-Readable Version of the University of Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars, Volume 1", SASC Document R-SAW-7/79-30. Warren, W. H. Jr. "Documentation for the Machine-Readable Version of the University of Michigan Catalogue of Spectral Types for the HD Stars, Volume 2", NSSDC Document NSSDC/WDC-A-R&S 81-03. 4-2 Table 4-2. Description of Remarks (1 of 4) (Reproduced from the original published version of the catalogue) Further information about 4836 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 29-32 of machine-readable version]: B indicates that the remark contains the HR (Bright Star Catalogue) number and the Bayer or Flamsteed designations where applicable. (1000 stars) L indicates that information from the astronomical literature is given. In most cases individual literature references are not given; references systematically searched 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. The entry "emission catalogue" refers to Wackerling's catalogue. O includes approximately 200 remarks that do not fit into any other category. Almost all of these are NGC or IC designations for nebulae. R Nearly on third 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. We discuss some of the more frequent types of 'R' remarks. 500 stars in the catalogue have composite spectra or possibly composite spectra and each of these has a remark so that it can be easily differentiated from known double stars which also sometimes have two types listed in the catalogue. In 300 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. 4-7 Table 4-2. Description of Remarks (2 of 4) (Reproduced from the original published version of the catalogue) Remarks are made for all stars (78) showing emission or filled-in lines, and the lines in emission are identified in the remark. For nebulae the lines in emission are often not listed. The great majority of Am stars do not have remarks, but approximately 90 do. Similarly some 65 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 40 of the 'R' remarks pertain to fuzzy or closely overlapped spectra some of which are probably new visual or spectroscopic doubles. Almost all of the approximately 50 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 5 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: 23 substantial disagreements with the HD catalogue, mainly with respect to spectral types; approximately 65 possible Fm Delta Del types; approximately 25 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 1829 doubles having a separation less than or equal to 30" and a magnitude difference less than 4.0 mag, since for these the spectral appearance and hence the assigned spectral type might be affected. 4-8 Table 4-2. Description of Remarks (3 of 4) (Reproduced from the original published version of the catalogue) 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. (168 stars) 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. Most of them 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 in advance of 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 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 Garrison, R. F. 1967, Ap. J., 147, 1003. t Hiltner, W. A., Garrison, R. F. and Schild, R. E. 1969, Ap. J., 157 313. L Hoffleit, D. 1982, Catalogue of Bright Stars, 4th revised ed. (New Haven: Yale University Observatory). 4-9 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 Luyten, W. J. 1979, "A Catalogue of Stars with Proper Motions Exceeding 0".5 Annually", 2nd Edition, University of Minnesota. L Uesugi, A. and Fukuda, I. 1982, "Revised Catalog of Stellar Rotational Velocities", Dept. of Astronomy, Kyoto University. L Wackerling, L. R. 1970, "Catalogue of Early-Type Stars Whose Spectra Have Shown Emission Lines", Mem. R.A.S., 73, 153. 4-10