The following document lists the file adc.doc
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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
Abstract
This document describes the computer-readable version of the Pho-
toelectric Photometric Catalogue in the Johnson 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.
1 Introduction
A copy of this document should be distributed with every copy of the
computer-readable catalog.
1.1 Description
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.
1
1.2 Reference
Lanz, T. 1986, Astron. Astrophys. Suppl. Ser., 65, 195.
2 Structure
2.1 Each File as a Whole
The UBVRI consists of 14 files. Table 2.1 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 2.2), the second file lists the mean values of the
data in the first file (Table 2.3), and the third file lists the full forms of
the references cited by code number in the first file (Table 2.4). 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.
___________________________________________________________
| Photoelectric Photometric Catalogue in the |
| Johnson UBVRI System (Lanz 1986) |
|___________________________________________________________|
| | | Record | Record | Number of |
| File | Contents | Format | Length | Records |
|______|______________________|________|________|___________|
| 1 | Johnson Observations | Fixed | 65 | 8,372 |
| 2 | Johnson Means | Fixed | 60 | 6,849 |
| 3 | Johnson References | Fixed | 80 | 361 |
| 4 | K & R Observations | Fixed | 65 | 467 |
| 5 | K & R Means | Fixed | 60 | 467 |
| 6 | K & R References | Fixed | 80 | 61 |
| 7 | M & B Observations | Fixed | 65 | 1,159 |
| 8 | M & B Means | Fixed | 60 | 1,150 |
| 9 | M & B References | Fixed | 80 | 36 |
| 10 | N & C Observations | Fixed | 65 | 252 |
| 11 | N & C Means | Fixed | 60 | 252 |
| 12 | N & C References | Fixed | 80 | 30 |
| 13 | Numbering | Fixed | 80 | 1,656 |
| 14 | Summary | Fixed | 118 | 8,253 |
|______|______________________|________|________|___________|
Table 1: Summary Description of Catalog Files
2
2.2 Observations (Files 1, 4, 7, and 10 of 14)
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 |
|_______|_______|___________|_________|___________________|
Table 2: Observations File Record Format
Identification Code number of the star in the system of Mermilliod (1978).
Multiplicity flag Single-character code: "D" indicates an unresolved binary
system; a number identifies one component of a multiple
system.
Variability flag "V" if the star is variable.
Count flag Single-character code qualifying the number in bytes 57-59.
The following codes are used:
/ Indicates that the actual number of observations was not
listed in the source reference; "1" has been assumed.
* Indicates that there were at least as many observations
as indicated in bytes 57-59.
S Indicates a standard star for which the the exact number
of observations is not known. This appears only once, in
the Johnson standard observations file.
3
Reference Code number of the source reference for this data. The full
forms of these references are listed in separate files for
each standard system (see Section 2.4).
2.3 Means (Files 2, 5, 8, and 11 of 14)
These files list the mean values derived from the observational data, homog-
enized 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 |
|_______|_______|___________|_________|___________________|
Table 3: Means File Record Format
Identification Code number of the star in the system of Mermilliod (1978)
Multiplicity flag Single-character code: "D" indicates an unresolved binary
system; a number identifies one component of a multiple
system.
Variability flag "V" if the star is variable.
Weight This is "not directly a quality, but is derived from the
total number of measurements."
2.4 References (Files 3, 6, 9, and 12 of 14)
These files list the code numbers and full forms of the references specific
to each standard system.
4
____________________________
| | Suggested | |
| Bytes | Format | Data |
|_______|___________|________|
| 1- 5 | I5 | Number |
| 6- 8 | 3X | Blank |
| 9-80 | A72 | Text |
|_______|___________|________|
Table 4: Numbering File Record Format
Number Code number by which this reference is cited in the corre-
sponding observational data file for this standard system.
Text Full form of the reference. When bytes 1-5 are blank, this
field continues the reference of the previous record.
2.5 Numbering (File 13 of 14)
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.
2.6 Summary (File 14 of 14)
This file can be broken down into four parts:
1. A summary of Lanz (1986), including a list of general references to the
catalog, a short explanation of the numbering system of Mermilliod (1978),
and a brief description of the tables which follow
2. A single long table listing identifications, homogenized mean values, and
references for HD and BD stars.
3. A series of short tables listing mean values and references for cluster
stars, by cluster.
4. A list of the full forms of the references cited by code number in the
preceding data tables.
This file is formatted as 118-byte lines of text which can be read and
printed out with a FORTRAN A118 format.
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3 History
3.1 Remarks and Modifications
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 Donnees 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.
3.2 References to the Documentation
Kunkel, W. E. and Rydgren, A. E. 1979, Astron. J., 84, 633.
Lanz, T. 1986, Astron. Astrophys. Suppl. Ser., 65, 195.
Lanz, T. 1986, unpublished documentation received with the catalog from the
CDS.
Mermilliod, J.-C. 1978, Bull. Inform. CDS, 14, 32.
Moffett, T. J. and Barnes III, T. G. 1979, Publ. Astron. Soc. Pac., 91, 180.
Morel, M. and Magnenat, P. 1978, Astron. Astrophys. Suppl. Ser., 34, 477.
Neckel, T. and Chini, R. 1980, Astron. Astrophys. Suppl. Ser., 39, 411.
6