Variable stars in the field of the open cluster NGC 6939 | Zendy

Maciejewski G. | Zendy; Georgiev Ts. | Zendy; Niedzielski A. | Zendy

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Variable stars in the field of the open cluster NGC 6939

Author(s) -

Maciejewski G.,

Georgiev Ts.,

Niedzielski A.

Publication year - 2008

Publication title -

astronomische nachrichten

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.394

H-Index - 63

eISSN - 1521-3994

pISSN - 0004-6337

DOI - 10.1002/asna.200710889

Subject(s) - physics , astrophysics , variable star , observatory , open cluster , telescope , astronomy , schmidt camera , cluster (spacecraft) , stars , cassegrain reflector , population , demography , sociology , computer science , programming language

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 the 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. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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