Eclipsing binary stars in the globular cluster M71

Details Eclipsing binary stars in the globular cluster M71 Eclipsing binary stars in the globular cluster M71

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..428j&link_type=abstract

Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he

Astronomy and Astrophysics

Astrophysics

Scientific paper

To search for variable stars in the globular cluster M71, we obtained time-series CCD images for 32 nights from 2000 July 8 to 2004 August 24. The CCD images were obtained with a thinned SITe 2k CCD camera attached to the 1.8m telescope at the Bohyunsan Optical Astronomy Observatory in Korea. The field of view of a CCD image is 11.6' x 11.6' (0.34"/pixel) at the f/8 Cassegrain focus of the telescope. We adjusted the exposure times from 50 s to 200 s (typically 100 s) in V band depending on the seeing (1.0" - 3.3") and transmission of the night sky. After photometric reduction, we detected 24 eclipsing binary stars. They are classified 8 EAs, 5 EBs and 11 EWs on the base of light curve shape. Ten of them are newly discovered in this research. We also have detected 16 the other type variable stars, too. Most of them are long period variable stars.

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