CCD Photometry of Variable Stars in the Field of the Globular Cluster NGC 6397

Details CCD Photometry of Variable Stars in the Field of the Globular Cluster NGC 6397 CCD Photometry of Variable Stars in the Field of the Globular Cluster NGC 6397

1996-01-31

arxiv.org/abs/astro-ph/9601193v1

Astronomy and Astrophysics

Astrophysics

14 pages, 6 figures, uuencoded postscript, submitted to A&A

Scientific paper

10.1051/aas:1997292

The $13.6\times 13.6$ arcmin$^{2}$ field covering the central part of the globular cluster NGC~6397 was surveyed in a search for short-period variable stars. We obtained light curves for 6 close binaries, 2 SX~Phe stars and 1 RR~Lyrae variable, 7 of which are new discoveries. Both identified SX~Phe variables are likely members of the cluster. One of the identified eclipsing binaries is most probably a field star while for the remaining 5 binaries our data do not preclude cluster membership. A $V$ vs. $B-V$ color-magnitude diagram extending from the tip of the red giant branch to below the main-sequence turnoff is presented.

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