J/AJ/131/1559 Diameters of Galactic open star clusters (van den Bergh+, 2006)
Diameters of open star clusters.
van den Bergh S.
<Astron. J., 131, 1559-1564 (2006)>
=2006AJ....131.1559V 2006AJ....131.1559V
ADC_Keywords: Clusters, open ; Morphology
Keywords: open clusters and associations: general
Abstract:
The present paper presents a tabulation of data on all 600 Galactic
open clusters for which it is currently possible to calculate linear
diameters. As expected, the youngest "clusters", with ages <15Myr,
contain a significant (≥20%) admixture of associations. Among
intermediate-age clusters, with ages in the range 15Myr to 1.5Gyr,
the median cluster diameter is found to increase with age. Small,
compact clusters are rare among objects with ages >1.5Gyr. Open
clusters with ages >1Gyr appear to form what might be termed a
"cluster thick disk", part of which consists of objects that were
probably captured gravitationally by the main body of the Galaxy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 600 Diameters of open clusters
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See also:
VII/229 : Optically visible open clusters and Candidates (Dias+ 2002-2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running cluster number
5- 15 A11 ---- Name Cluster name
17- 19 I3 deg l Truncated Galactic longitude
21- 25 F5.2 pc Diam Cluster diameter
27- 31 I5 pc R Cluster distance from the Sun
33- 37 I5 pc Z Galactic plane scale height (1)
39- 42 F4.2 mag E(B-V) ? The reddening from photoelectric photometry
44- 48 F5.2 [yr] logT ? Log of the cluster age (2)
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Note (1): assuming Z=Rsin(b).
Note (2): As derived from its dereddened color-magnitude diagram.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 08-Feb-2007