Portal de Periódicos da CAPES

Time Series Photometry of Variable Stars in the Globular Cluster NGC 6397

2003; Institute of Physics; Volume: 125; Issue: 5 Linguagem: Inglês

10.1086/374236

1538-3881

J. Kałużny, I. B. Thompson,

Astronomy and Astrophysical Research

Time series BVI photometry is presented for 16 short-period variables located in the central region of the globular cluster NGC 6397. The sample includes nine newly detected variables. The light curve of cataclysmic variable CV6 shows variability with a period of 0.2356 days. We confirm an earlier reported period of 0.472 days for cataclysmic variable CV1. Phased light curves of both CVs exhibit sinelike light curves, with two minima occurring during each orbital cycle. The secondary component of CV1 has a low average density of 0.83 g cm-3, indicating that it cannot be a normal main-sequence star. Variables among the cluster blue stragglers include a likely detached eclipsing binary with orbital period of 0.787 days, three new SX Phoenicis stars (one of which has the extremely short period of 0.0215 days), and three low-amplitude variables that are possible γ Doradus variables.