SX Phoenicis Stars in the Globular Cluster NGC 5466

Abstract

Through time-series CCD photometry of the globular cluster NGC 5466, we have detected nine SX Phoenicis stars including three new ones. All the SX Phoenicis stars are located in the blue straggler region in the color-magnitude diagram of NGC 5466. Five of them show clearly double-radial mode features, the periods of which are well consistent with the theoretical ratio of the first overtone mode to the fundamental mode (P${}_{1H}$/P${}_F$). Normally, it has not been easy to secure a P-L relation of the SX Phoenicis stars, because determination of the pulsational mode of the SX Phoenicis stars has been difficult. The existence of five SX Phoenicis stars in NGC5466 with double-radial modes allows us to derive reliably a P-L relation for the fundamental mode of the SX Phoenicis stars. Using seven SX Phoenicis stars including five stars with double-radial modes, we derive a P-L relation for the fundamental mode in NGC 5466, $<V>=-3.25(\pm 0.46)LogP+14.70(\pm 0.06),(\sigma =\pm 0.04)$, corresponding to $<M_V>=-3.25(\pm 0.46)LogP-1.30(\pm 0.06)$ for an adopted distance modulus of $(m-M{)}_0=16.00$ and zero reddening.

20 figures, scheduled for the July 2004 issue of The Astronomical Journal

References in corpus (6)

• Variable Stars in Galactic Globular Clusters
• Discovery and analysis of p-mode and g-mode oscillations in the A-type primary of the eccentric binary HD 209295
• Cluster AgeS Experiment. CCD photometry of SX Phoenicis variables in the globular cluster M 55
• Linear nonadiabatic properties of SX Phoenicis variables
• New SX Phoenicis Stars in the Globular Cluster M53
• A New SX Phe Star in the Globular Cluster M15

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• Exploring the variable stars in the globular cluster NGC5024 (M53): New RR Lyrae and SX Phoenicis stars
• Variable stars in the Globular Cluster NGC 2808
• CCD time-series photometry of the globular cluster NGC 5053: RR Lyrae, Blue Stragglers and SX Phoenicis stars revisited
• A Comprehensive, Wide-Field Study of Pulsating Stars in the Carina Dwarf Spheroidal Galaxy
• Detection of a White Dwarf companion to a Blue Straggler Star in the outskirts of globular cluster NGC 5466 with the Ultraviolet Imaging Telescope (UVIT)
• A Census of Variability in Globular Cluster M68 (NGC 4590)
• Metal-Rich SX Phe stars in the Kepler Field
• CCD Photometry of the globular cluster NGC 5466. RR Lyrae light curve decomposition and the distance scale
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• The field high-amplitude SX Phe variable BL Cam: results from a multisite photometric campaign. II. Evidence of a binary - possibly triple - system
• The globular cluster M10: Reassessment of stellar membership, distance and age using its variable and HB stars
• The TAOS Project Stellar Variability I. Detection of Low-Amplitude delta Scuti Stars
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• Zwicky Transient Facility and Globular Clusters: The Period-Luminosity and Period-Wesenheit Relations for SX Phoenicis Variables in the gri-Band
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