Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262...49k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 1, p. 49-56.
Astronomy and Astrophysics
Astronomy
30
Eclipsing Binary Stars, Light Curve, Open Clusters, Stellar Magnitude, Variable Stars, Color-Magnitude Diagram, Galactic Clusters, Power Spectra
Scientific paper
We report the results of a CCD search for short-period variables in the field of the old open cluster Berkeley 39. Twelve variables were discovered among roughly 2000 stars with I greater than 20.0. We argue that all or almost all discovered variables are members of Be 39. Eleven variables are contact binaries (W UMa-type systems) with periods ranging from 0.225 to 0.546 d. The twelfth variable is probably an eclipsing binary with a period of the order of 1 d. Four variables are located among the blue stragglers on the cluster color-magnitude diagram. The distribution of binaries along this diagram (a 5-mag spread) favors the theory that the Berkeley 39 W UMa-type systems have been formed mainly through the mechanism of magnetic braking.
Kaluzny Janusz
Krzeminski Wojciech
Mazur Beata
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