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A&A Supplement series, Vol. 122, April I 1997, 1-7

Received February 12; accepted June 18, 1996

CCD photometry of variable stars in the field of the globular cluster NGC 6397

J. Kaluznygif

Send offprint request: J. Kaluzny
Warsaw University Observatory, Al. Ujazdowskie  4, 00-478  Warsaw, Poland


The tex2html_wrap_inline1066 field including 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 tex2html_wrap_inline1068. B-V color-magnitude diagram extending from the tip of the red giant branch to below the main-sequence turnoff is presentedgif.

keywords: globular clusters: individual: NGC 6397 -- star: variables: other -- HR diagram -- blue stragglers -- stars: close binaries

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