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2  Structure

2.1  Each File as a Whole

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.

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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

Summary Description of Catalog Files

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.

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		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

Observations File Record Format

20ex

3ex

2.3  Means (Files 2, 5, 8, and 11 of 14)

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.''

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		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

Means File Record Format

20ex

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.

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	Suggested
Bytes	Format	Data
1- 5	I5	Number
6- 8	3X	Blank
9-80	A72	Text

Numbering File Record Format

20ex

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.

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 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.

3.2  References to the Documentation