Disclaimer: The following document (from catalogue II/116) results from an on-line translation from latex to html (the cgiprint tool developed at CDS). The correct presentation requires an execution of latex on the original file
Photoelectric Photometric Catalogue in the |
Johnson UBVRI System |
(Lanz 1986) |
Documentation for the Computer-Readable Version |
Anne C. Raugh |
October 1987 |
Doc. No. STX-T-25-3002-0022-87 |
Contract NAS 5-28752 |
Prepared for: |
National Aeronautics and Space Administration |
Goddard Space Flight Center |
Greenbelt, MD 20771 |
Prepared by: |
ST Systems Corporation |
4400 Forbes Blvd. |
Lanham, Maryland 20706 |
This document describes the computer-readable version of the Photoelectric Photometric Catalogue in theJohnson UBVRI System (Lanz 1986) distributed by the Astronomical Data Center, NASA
Goddard Space Flight Center. This catalog is a compilation of photoelectric
photometry in the Johnson UBVRI system published prior to mid-1984.
Included are data reduced with the Johnson UBVRI standard stars as well
as three other secondary sets of standards. Listed are code number, V,
U–B, B–V, V–R, R–I, I, number of observations, references, and
mean values for a total of 6,849 stars in the original Johnson system (Morel
and Magnenat 1978), 467 stars in the system of Kunkel and Rydgren (1979), 1,150
stars in the system of Moffett and Barnes III (1979), and 252 stars in the
system of Neckel and Chini (1980).
The catalog is in 14 files. Three files are included for each standard system:
the first file lists the published data; the second file lists the mean values
from the data in the first homogenized to the standard system; and the third
file lists references. Two additional files contain (1) a description of the
numbering system of Mermilliod (1978) used to identify catalog objects, and (2)
a summary file with introductory information and references formatted for
printing. The present document describes the overall file structure and the
individual data fields.
A copy of this document should be distributed with every copy of the computer-readable catalog.
The Photoelectric Photometric Catalogue in the Johnson UBVRI System (UBVRI; Lanz 1986) is a compilation of photoelectric photometry in the Johnson UBVRI system published prior to mid-1984. Included are the data compiled by Morel and Magnenat (1978) along with more recent observations in the Johnson standard system; and, in separate files, data reduced using the secondary standards of Kunkel and Rydgren (1979), Moffett and Barnes III (1979), and Neckel and Chini (1980).
The catalog is in 14 files: the first 12 files list observational data, mean values, and references for each of the four standard systems; one file describes the numbering scheme of Mermilliod (1978) used to identify objects in this catalog; and a final file contains a summary of Lanz (1986) with several tables of mean results and references for HD/BD stars and cluster stars.
There are three files for each standard system: the first file lists identification, V, U–B, B–V, V–R, R–I, I, number of observations, and reference; the second file lists the homogenized, mean values of the data in the first file; and the third file lists the full forms of the references cited in the first file.
The UBVRI consists of 14 files. Table t:files gives the file attributes that are the same no matter what computer the catalog is copied for. All records are of fixed length. The first file for each standard system contains the observational data (Table t:obs), the second file lists the mean values of the data in the first file (Table t:means), and the third file lists the full forms of the references cited by code number in the first file (Table t:refs). The thirteenth file contains a description of the numbering system used to identify objects in this catalog. The fourteenth file contains a summary of Lanz (1986), tables of mean values for HD/BD stars and cluster stars, and references. Detailed descriptions of each file are given in the following sections.
Quotations in any of the following descriptions come from Lanz (1986) unless otherwise noted.
These files list the observational data with references for each of the standard systems. A blank field indicates no data.
Suggested | Default | |||
Bytes | Units | Format | Value | Data |
1-11 | — | I11 | — | Identification |
12 | — | A1 | — | Multiplicity flag |
13 | — | A1 | — | Variability flag |
14-20 | mag | F7.3 | — | V |
21-27 | mag | F7.3 | — | U-B |
28-34 | mag | F7.3 | — | B-V |
35-41 | mag | F7.3 | — | V-R |
42-48 | mag | F7.3 | — | R-I |
49 | — | 1X | — | Blank |
50-54 | mag | F5.2 | — | I |
55 | — | 1X | — | Blank |
56 | — | A1 | — | Count flag |
57-59 | — | I3 | — | Number of obs. |
60 | — | 1X | — | Blank |
61-65 | — | I5 | — | Reference |
These files list the mean values derived from the observational data, homogenized to the standard system. A blank field indicates no data. Mean color has not been calculated for variable stars, ``as it was preferred to retain one measurement, generally that with the brightest V magnitude.''
Suggested | Default | |||
Bytes | Units | Format | Value | Data |
1-11 | — | I11 | — | Identification |
12 | — | A1 | — | Multiplicity flag |
13 | — | A1 | — | Variability flag |
14-20 | mag | F7.3 | — | V |
21-27 | mag | F7.3 | — | U–B |
28-34 | mag | F7.3 | — | B–V |
35-41 | mag | F7.3 | — | V–R |
42-48 | mag | F7.3 | — | R–I |
49 | — | 1X | — | Blank |
50-54 | mag | F5.2 | — | I |
55 | — | 1X | — | Blank |
56-58 | — | I3 | — | Weight |
59-60 | — | 2X | — | Blank |
These files list the code numbers and full forms of the references specific to each standard system.
Suggested | ||
Bytes | Format | Data |
1- 5 | I5 | Number |
6- 8 | 3X | Blank |
9-80 | A72 | Text |
This file contains a description of the numbering system of Mermilliod (1978) used to identify objects in this catalog. It includes references as well as tables of code numbers, and it is formatted as 80-byte lines of text, which can be read and printed out with a FORTRAN A80 format.
This file can be broken down into four parts:
This file is formatted as 118-byte lines of text which can be read and printed out with a FORTRAN A118 format.
The Photoelectric Photometric Catalogue in the Johnson UBVRI System (UBVRI) was received by the Astronomical Data Center (ADC), NASA Goddard Space Flight Center, from the Centre de Données Astronomiques, Strasbourg (CDS), in December 1986.
The original tape consisted of 15 text files. The first contained a description of the 14 catalog files and has been incorporated into this document; the remaining files were formatted as described in the preceding sections. A FORTRAN program was run to check the validity of each field according to its data type and value. As a result, the character ``S'', found in the number of obs. field in one record of the Johnson standard observation file, was moved to the count flag field and the number of obs. field left blank so that this field could be read by the FORTRAN I3 format indicated. No other changes were made to any of the files.