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

J. Kałużny | Zendy; I. B. Thompson | Zendy

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

Author(s) -

J. Kałużny,

I. B. Thompson

Publication year - 2003

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/374236

Subject(s) - light curve , globular cluster , photometry (optics) , astrophysics , blue straggler , physics , orbital period , variable star , astronomy , cataclysmic variable star , main sequence , stars , white dwarf

Time series BVI photometry is presented for 16 short-period variables locatedin the central region of the globular cluster NGC 6397. The sample includes 9newly detected variables. The light curve of cataclysmic variable CV6 showsvariability with a period of 0.2356 days. We confirm an earlier reported periodof 0.472 days for cataclysmic variable CV1. Phased light curves of both CVsexhibit sine-like light curves, with two minima occurring during each orbitalcycle. The secondary component of CV1 has a low average density of 0.83g/cm^{3} indicating that it cannot be a normal main sequence star. Variablesamong the cluster blue stragglers include a likely detached eclipsing binarywith orbital period of 0.787 days, three new SX Phe stars (one of which has theextremely short period of 0.0215 days), and three low amplitude variables whichare possible gamma Doradus variables.Comment: 28 pages, 13 figure

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