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

Abstract

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$\pm 0.06\pm 0.1$mag.

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References in corpus (7)

• Variable Stars in Galactic Globular Clusters
• BVI time series data of the Galactic Globular Cluster NGC3201. I. RR Lyrae stars
• Cluster AgeS Experiment. CCD photometry of SX Phoenicis variables in the globular cluster M 55
• An Extinction Map and Color Magnitude Diagram for the Globular Cluster NGC 3201
• Linear nonadiabatic properties of SX Phoenicis variables
• SX Phoenicis Stars in the Core of 47 Tucanae
• Variable Stars in the Field of the Globular Cluster NGC 3201

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