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arXiv:0711.4916 (astro-ph)
[Submitted on 30 Nov 2007]

Title:Variable stars in the field of open cluster NGC 6939

Authors:G. Maciejewski, Ts. Georgiev, A. Niedzielski
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Abstract: The results of CCD photometric survey performed with the 90/180 cm Schmidt-Cassegrain Telescope of the Nicolaus Copernicus University Astronomical Observatory in Piwnice (Poland) and the 70/172 cm Schmidt Telescope of the National Astronomical Observatory (NAO) at Rozhen (Bulgaria) of the field of 1 Gyr old open cluster NGC 6939 are presented. Twenty two variable stars were detected, four of them previously known. Four eclipsing systems (3 detached and 1 contact binary) were found to be members of the cluster. Analysis of the brightness of the contact binary V20 strongly supports the distance to the cluster of 1.74 +/- 0.20 kpc. The small population of contact binaries in NGC 6939 confirms also the relatively young age of the cluster.
Comments: 9 pages, 3 figures, accepted for publication in AN
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0711.4916 [astro-ph]
  (or arXiv:0711.4916v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0711.4916

Submission history

From: Gracjan Maciejewski [view email]
[v1] Fri, 30 Nov 2007 11:51:27 UTC (42 KB)
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