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