Variable stars in the globular cluster NGC 3201. I. Multimode SX Phe-type variables

Details Variable stars in the globular cluster NGC 3201. I. Multimode SX Phe-type variables Variable stars in the globular cluster NGC 3201. I. Multimode SX Phe-type variables

2003-04-21

arxiv.org/abs/astro-ph/0304359v1

Mon.Not.Roy.Astron.Soc. 340 (2003) 1205-1213

Astronomy and Astrophysics

Astrophysics

10 pages, requires mn2e.cls,contact the first author at batka@camk.edu.pl for high-resolution figures

Scientific paper

10.1046/j.1365-8711.2003.06361.x

We report on the discovery of eleven multimode SX Phoenicis--type blue stragglers in the field of the southern globular cluster NGC 3201. In these variables both radial and non-radial modes are excited. For three variables the derived period ratio is close to that observed in SX Phoenicis itself, suggesting that these stars are pulsating in the fundamental and the first-overtone radial modes. Using the McNamara (1997) period-luminosity relation we have estimated the apparent distance modulus to NGC 3201 to be 14.08$\pm0.06\pm0.1$mag.

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