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Using SX Phœnicis Variables in M55 and Theoretical Period-Luminosity (-Colour-Metallicity) Relations for Distance Determination

Published online by Cambridge University Press:  12 April 2016

J.O. Petersen  and
L.M. Freyhammer
J.O. Petersen
Affiliation:
Astronomical Observatory, NBIfAPG, Copenhagen, Denmark
L.M. Freyhammer
Affiliation:
Royal Observatory of Belgium andUniversity of Brussels (VUB), Brussels, Belgium

Abstract

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Theoretical period-luminosity and period-luminosity-colour-metallicity relations are used to give distance estimates for the globular cluster M55 from detailed data for 24 SX Phœnicis variables published recently by Pych et al. (2001). With accurate determinations of effective temperatures for the SX Phe stars application of period-luminosity-colour-metallicity relations will lead to improved distances and more secure mode identifications.

Type
Part 1.3. Stellar Pulsation and the Distance Scale
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 136 - 137
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Petersen, J.O. & Christensen-Dalsgaard, J. 1999, A&A, 352, 547 Google Scholar
Pych, W., Kaluzny, J., Krzeminski, W., Schwarzenberg-Czerny, A., & Thompson, I.B. 2001, A&A, 367, 148 Google Scholar