NSSDC/WDC-A-R&S 81-02 DOCUMENTATION FOR THE MACHINE-READABLE VERSION OF THE THIRTEEN-COLOR PHOTOMETRY OF 1380 BRIGHT STARS Wayne H. Warren Jr. and Nancy G. Roman March 1981 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 ............................................... 1-1 Section 2 - FILE CONTENTS .............................................. 2-1 Section 3 - FILE CHARACTERISTICS ....................................... 3-1 Section 4 - REMARKS AND REFERENCES ..................................... 4-1 LIST OF TABLES Table 1 File Contents ....................................................... 2-1 2 Remarks to Catalogue Data Records ................................... 2-4 3 File Characteristics ................................................ 3-1 ii SECTION 1- INTRODUCTION The "Catalogue of Thirteen-Color Photometry of 1380 Bright Stars" contains final data on the 13-color medium-narrow-band photometric system, as published by Johnson and Mitchell (1975). Observations of essentially all stars brighter than fifth visual magnitude north of declination= -20 degrees and brighter than fourth visual magnitude south of declination= -20 degrees are included. This document describes the version of the above catalogue. It is intended to enable users to read and process the files without the common difficulties and uncertainties. It should be distributed along with any unmodified machine-readable version of the catalogue. 1-1 SECTION 2- FILE CONTENTS A byte-by-byte description of the contents of the catalogue is given in Table 1. A suggested format specification for reading each datum is given in the final column, but can be modified depending upon usage. Although real format specifications are given for magnitude and color-index data in order to indicate the location of decimal points, these data should be read initially with A (character) format specifications or buffered in because the data fields are blank for missing data. Table 1. File Contents. Thirteen-Color Photometry of 1380 Bright Stars Suggested Byte(s) Description Format 1 "*" if remark to table, otherwise blank A1 2- 5 Number (BS = HR) in Yale Bright Star I4 Catalogue (Hoffleit 1964) 6- 8 Miscellaneous information regarding A3 identification or physical characteristics; e.g. /X,/XX, -X for additional HR numbers included V, D in bytes 7-8 for variable, double star . in byte 8 for uncertainty * 3 stars contain asterisks in byte 7, but meaning is not defined in paper, nor could any common peculiar characteristics be found. The stars are HR4883, 6707, and 8143. 9 Blank 1X 10- 25 Spectral type from miscellaneous sources A16 10- 11 luminosity class for Mt. Wilson types, W in W-R types 12- 13 temperature class and subclass 14- 25 additional spectral-type information See Section 4 for additional information 26 X if 52 magnitude transformed from Cape V mag., A1 otherwise blank 27 Blank 1X 28- 33 52 magnitude (see byte 26 description) F6.3 34 Blank 1X 2-1 Table 1. (continued) Suggested Byte(s) Description Format 35- 40 33 - 52 color (blank if no data) F6.3 41 Blank 1X 42- 47 35 - 52 color F6.3 48 Blank 1X 49- 54 37 - 52 color F6.3 55 Blank 1X 56- 61 40 - 52 color F6.3 62 Blank 1X 63- 68 45 - 52 color F6.3 69 Blank 1X 70- 75 52 - 58 color F6.3 76 Blank 1X 77- 82 52 - 63 color F6.3 83 Blank 1X 84- 89 52 - 72 color (blank if no data) F6.3 90 Blank 1X 91- 96 52 - 80 color (blank if no data) F6.3 97 Blank 1X 98-103 52 - 86 color (blank if no data) F6.3 104 Blank 1X 105-110 52 - 99 color (blank if no data) F6.3 111 Blank 1X 112-117 52 - 110 color (blank if no data) F6.3 118 Blank 1X 2-2 Table 1. (concluded) Suggested Byte(s) Description Format 119-120 Number of blue observations (filters 33 to 63) I2 121 Blank 1X 122-123 Number of red observations (filters 72 to 110) I2 Table 2 contains remarks for records in the catalogue which contain an asterisk (*) in byte 1. The remarks are taken directly from the paper of Johnson and Mitchell (l975). Table 2. Remarks to Catalogue Data Records HR Name Remarks 215 Zet And 58 filters differ by >0.10 mag 681 Omi Cet 39831.6 matched to 39151.6 1239 Lam Tau 39873.6 matched to 39440.8 1845 CE Tau 39831.8 matched to 39499.7 2061 Alp Ori 39797.9 matched to 38787.7 2308 BL Ori 39773.9 matched to 39501.8 2590 Pi CMa 58 filters differ by >0.10 mag. May be variable. 2650 Zet Gem 39804.9 matched to 38789.8 4163 U Hya 58 filters differ by >0.10 mag. 33 - 52 = 12. is lower limit. 33 was not measurable. 4846 Gam CVn 39867.9 matched to 39176.9. 33 - 52 = 12. is lower limit. 33 was not measurable. 4915 Alp2 CVn 39930.7 matched to 38894.7 5056 Alp Vir 39930.8 matched to 39176.9 5589 RR UMi 39910.9 matched to 39257.8 6146 g Her 39969.8 matched to 38929.7 6406 Alp Her 39973.7 matched to 39227.9 6431 Mu Her 58 filters differ by >0.10 mag. 7066 R Sct 39974.9 matched to 38917.8 7564 Chi Cyg 40004.9 matched to 40006.9 (unpublished data) 7570 Eta Aql 39976.9 matched to 38871.9 8262 W Cyg 58 filters differ by >0.10 mag. 8297 V460 Cyg 33 - 52 = 12. is lower limit. 33 was not measurable. 8316 Mu Cep 58 filters differ by >0.10 mag. 8383 VV Cep 58 filters differ by >0.10 mag. 8571 Del Cep 39278.8 matched to 39459.6 8752 HD 217476 58 filters differ by >0.10 mag. 2-3 SECTION 3 - FILE CHARACTERISTICS The information contained in Table 3 is sufficient for a user to read the machine version of the catalogue. Information for the entire catalogue is given in the table, but data 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 for tapes: these parameters should always be supplied if secondary copies of the catalogue are transmitted to other users or installations. Table 3. File Characteristics. Thirteen-Color Photometry of l380 Bright Stars NUMBER OF FILES ........................................................ 1 LOGICAL RECORD LENGTH ................................................ 123 RECORD FORMAT .......................................................Fixed TOTAL NUMBER OF LOGICAL RECORDS ..................................... 1380 3-1 SECTION 4 - REMARKS AND REFERENCES A magnetic tape version of the Thirteen-Color Photometry of 1380 Bright Stars was received from the Centre de Donnees Stellaires (CDS), Strasbourg (Identification Number 2052A78). As received, the spectral types had no uniformly coded fields for searching purposes, and no flags were included in the records to indicate remarks. In order to improve the uniformity of the spectral types, the entire catalogue was transferred from tape to disk at the Astronomical Data Center, and modifications were made interactively. The spectral types were modified such that the temperature class and subclass always occur in bytes 12 and 13, respectively. Mt. Wilson luminosity codes (g, d, sg, c, etc.) were shifted to occur uniformly in bytes 10-11, as was the W in each Wolf-Rayet type. Characters which are lower case in standard astronomical notation (e.g., Mt. Wilson luminosity codes, m and p in peculiar and metallic-line A stars, a, b, ab in luminosity classes, e for emission-line stars, etc.) were converted from upper to lower case. These characters should print as normal upper-case characters on conventional upper-case-only printers, but the use of an extended chain printer is suggested if one is available. The asterisks were also added as the remarks flag in byte 1 and the catalogue was transferred back to magnetic tape. A considerable number of stars had no MK types in the catalogue as received. When available, these types were added from the catalogues of M. Jaschek (1978), Kennedy (1978) and Morgan and Keenan (1973). Additional MK types were found for stars south of -40 degrees in Houk and Cowley (1975) and Houk (1978). Where possible, attempts were made to resolve uncertainties and to correct obvious errors. The order of the files (by HR number) is unchanged from the published catalogue (Johnson and Mitchell 1975), but they do differ slightly in that the star names present in the published catalogue (Table 7) have never been present on the disk. 4-1 REFERENCES Hoffleit, D. (1964). Catalogue of Bright Stars, 3rd edition (Yale University Observatory). Houk, N. (1978). Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars, Volume 2 (Department of Astronomy, Univ. Michigan, Ann Arbor). Houk, N. and Cowley, A. P. (1975). University of Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars, Volume 1 (Department of Astronomy, Univ. Michigan, Ann Arbor). Jaschek, M. (1978). Catalogue of Selected Spectral Types in the MK System, Bull. Inf. Cent. Donnees Stellaires, No. 15, p. 121. Johnson, H. L., and Mitchell, R. I. (1975). Rev. Mexicana Astron. Astrof. 5 299. Kennedy, P. M. (1978). MK Classification Extension (Mt. Stromlo Obs.) Morgan, W. W., and Keenan, P. C. (1973). Annu. Rev. Astron. Astrophys. 11, 29 5-1