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VII/5A Star Clusters and Associations, Selected Data (Alter+ 1970)
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Excerpt from the Catalogue of Stars Clusters and Associations
Alter G., Ruprecht J., Vanysek V.
<Akad. Kiado, Budapest, 3086 p., 2nd edition (1970)>
=1970csca.book.....A
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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)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 85 1039 The Catalogue
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See also:
Part I (Associations, catalogue VII/31B)
Part II (Globular Clusters, catalogue VII/44B)
Part III (Open Clusters, catalogue VII/101)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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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 Trumpler 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
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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
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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.
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(End) 19-Mar-1994