New variable stars in the globular cluster NGC 288^*,**

¹ Warsaw University Observatory, Al. Ujazdowskie  4, 00-478 Warsaw
² Carnegie Observatories, Las Campanas Observatory, La Serena, Cailla 601, Chile

Send offprint request to: J. Kaluzny

Received: 20 January 1997
Accepted: 22 January 1997

Abstract

We report discovery of 3 new faint variables in the globular cluster NGC 288: 2 SX Phe stars and 1 contact binary. Both SX Phe variables are blue stragglers. The contact binary is located below cluster turnoff, slightly to the red of the main sequence. New photometry of 6 previously known variables is also presented. We note that 26 out of a total 43 SX Phe stars identified recently in ω Cen and NGC 288 exhibit V-band light curves with full amplitudes smaller than 0.10 mag. The sample of known SX Phe stars is likely to be significantly incomplete in regard to the low amplitude variables.