CCD Photometry of Faint Variable Stars in the Globular Cluster NGC 6752

Details CCD Photometry of Faint Variable Stars in the Globular Cluster NGC 6752 CCD Photometry of Faint Variable Stars in the Globular Cluster NGC 6752

1999-04-02

arxiv.org/abs/astro-ph/9904026v1

Astronomy and Astrophysics

Astrophysics

18 pages, LaTex, 9 figures (Fig. 1 not available), accepted for publication in the Astronomical Journal

Scientific paper

10.1086/300918

We present the results of a photometric survey for variable stars in the field of the nearby globular cluster NGC 6752. The cluster was monitored in 1996 and 1997 for a total of 54 hours with 3 different CCD cameras mounted on the 1.0-m Swope telescope. Eleven new variables were identified: 3 SX Phe stars, 7 contact binaries and 1 candidate detached eclipsing binary. All 3 SX Phe variables are likely members of the cluster while only 1 out of the 7 contact binaries is a potential cluster member. As a by-product of our survey we obtained UBV photometry for a large sample of stars in the cluster field. Two stars with U-B \approx -1.0 and V=19.3 and V=20.6 were identified. They lie along the extended horizontal branch of the cluster, and are likely to be faint sdB stars from NGC 6752.

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