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VII/5A              Star Clusters and Associations, Selected Data (Alter+ 1970)

Excerpt from the Catalogue of Stars Clusters and Associations Alter G., Ruprecht J., Vanysek V. <Akad. Kiado, Budapest, 3086 p., 2nd edition (1970)>
ADC_Keywords: Associations, stellar ; Clusters, open Description: The catalog is a selection of data on all open clusters extracted from the second, considerably enlarged edition of the "Catalogue of Star Clusters and Associations" edited by Alter, Balazs, and Ruprecht (1970), which includes four parts: Part 1: 1039 open clusters, five moving clusters, and 11 stellar groups; Part 2: 70 OB associations; Part 3: 125 globular clusters; Part 4: 28 extragalactic objects. The catalog includes galactic and equatorial coordinates, name, classification, angular diameter, distance, magnitude and spectral types of the brightest stars, total magnitude, and color excess. References: Alter, G., Balazs, B., and Ruprecht, J. 1970, Catalogue of Star Clusters and Associations, 2nd Edition, Akademiai Kiada Budapest, printed in Hungary (card form) See also: Part I (Associations, catalogue VII/31) Part II (Globular Clusters, catalogue VII/44) Part III (Open Clusters, catalogue VII/101) File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog 85 1039 The Catalogue
Byte-by-byte Description of file: catalog
Bytes Format Units Label Explanations
1- 6 F6.2 deg GLON Galactic longitude 7- 12 F6.2 deg GLAT Galactic latitude 14- 15 I2 h RAh Hours RA, equinox 1950.0 17- 20 F4.1 min RAm Minutes RA, equinox 1950.0 21 A1 --- DE- Sign Dec, equinox 1950.0 22- 23 I2 deg DEd Degrees Dec, equinox 1950.0 25- 26 I2 arcmin DEm Minutes Dec, equinox 1950.0 28- 44 A17 --- Name Cluster name 46- 49 A4 --- Class Trumbler class. codes, see below. The following coding is used: 32p = III 2 p 43pn = IV 3 p n, etc. 51- 55 F5.1 arcmin Diam []? Angular diameter 57- 61 I5 pc Dist []? Cluster distance 63- 66 F4.1 mag Mag1 []? Magnitude of brightest stars in cluster 68- 69 A2 --- SpType Spectral type 71 A1 --- Code1 Unidentified code 73- 76 F4.1 mag IntMag []? Total or integrated magnitude of the cluster 78 A1 --- Code2 Unidentified code 80- 83 F4.2 mag ColorEx []? Color excess of the cluster in UBV system 85 A1 --- Code3 Unidentified code
Note: Trumpler classification system (see Trumpler, R. J. 1930, Lick Obs. Bull. 14, 154) First figure: Appearance (projected distribution of stars) I Detached cluster with strong central concentration. II Detached cluster with little central concentration. III Detached cluster with no noticeable concentration, i.e., a uniform distribution of stars within the cluster boundaries. IV Cluster that appears more like a star field concentration. Second figure: Stellar brightnesses 1 Most cluster stars are nearly of the same apparent brightness. 2 A medium range in the brightnesses of stars. 3 Bright and faint stars are both present. Generally a few very bright stars and some moderately bright stars embedded in a body of fainter stars can be seen. Third figure: Number of stars p a poor cluster, n < 50 stars. m a moderately rich cluster, 50 < n < 100 stars. r a rich cluster, n > 100 stars. Fourth figure: Other characteristics e elongated u asymmetrical n associated nebulosity Historical Notes: 1988 May: Wayne H. Warren Jr. Astronomical Data Center The machine-readable version of this compilation was received from the Centre de Donnees de Strasbourg in January 1979. A brief format description had been prepared there through a comparison of the data with the second edition of the published catalog, since the original description only consisted of the following statement: "The file contains information about coordinate type, distance, diameter, etc.... for all open clusters known in 1968." The original format was condensed and contained mostly integer numbers that were difficult to read and interpret. Therefore, the catalog format was modified and expanded at the Astronomical Data Center, NASA Goddard Space Flight Center, and this new description has been prepared for the new format. A copy of the original catalog was sent to Dr. Charles J. Peterson of the University of Missouri, Columbia, who prepared notes about the format and identification of many of the data, and the description below is based partly on these notes. We appreciate the efforts of Dr. Peterson in describing the data and returning this information to the ADC, and for communicating with us at length about the catalog.
(End) 19-Mar-1994
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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