A&A Supplement series, Vol. 122, April I 1997, 1-7
Received February 12; accepted June 18, 1996
J. Kaluzny
Send offprint request: J. Kaluzny
Warsaw University Observatory,
Al. Ujazdowskie 4, 00-478 Warsaw, Poland
e-mail: jka@sirius.astrouw.edu.pl
The 
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 
. B-V color-magnitude diagram extending from the
tip of the red giant branch to below the main-sequence turnoff
is presented.
keywords: globular clusters: individual: NGC 6397 -- star: variables: other -- HR diagram -- blue stragglers -- stars: close binaries