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Double-radial-mode SX Phoenicis stars in the globular clusters NGC 5466 and M71

Published online by Cambridge University Press:  12 April 2016

Young-Beom Jeon ,
Myung Gyoon Lee ,
Seung-Lee Kim  and
Ho Lee
Young-Beom Jeon
Affiliation:
Korea Astronomy Observatory, Daejeon, 305-348, Korea
Myung Gyoon Lee
Affiliation:
Astronomy Program, SEES, Seoul National University, Seoul, 151-742, Korea
Seung-Lee Kim
Affiliation:
Korea Astronomy Observatory, Daejeon, 305-348, Korea
Ho Lee
Affiliation:
Department of Earth Science Education, Korea National University of Education, Choongbuk, 363-791, Korea

Abstract

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Through time-series CCD photometry of the globular cluster NGC 5466, we found three double-radial-mode SX Phe stars, all of which are consistent with the theoretical period ratio of the first overtone mode to the fundamental mode (P1H/PF); their period ratios are 0.7825, 0.7826 and 0.7919, respectively. We also detected a double-radial-mode SX Phe star in M71. Its period ratio is 0.781, which is also consistent with the theoretical value.

Type
Part 3. Variable stars as tracers of different stellar populations – galactic and globular clusters, LMC/SMC and Local Group galaxies
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 166 - 170
Copyright
Copyright © Astronomical Society of the Pacific 2004

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