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The Luminosities of 13 Field RR Lyrae Stars: The Correlation with Metallicities

Published online by Cambridge University Press:  12 April 2016

T. Liu  and
K.A. Joens
T. Liu
Affiliation:
Boston University
K.A. Joens
Affiliation:
Boston University

Abstract

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We have obtained UBVRI and JK photometry and radial velocities for 13 field RR Lyrae stars with a large range of metallicity. Our sample includes eleven ab-type and two c-type variables. The surface brightness method is applied to these RR Lyrae stars to determine their mean absolute magnitudes <MV> as well as their distances and radii. We have used the Kurucz’s model atmospheres to provide metallicity- and gravity-dependent color-temperature transformations and bolometric corrections. Our results indicate a clear correlation between the luminosities of the RR Lyrae stars and their metallicities such that metal-poor RR Lyrae stars are more luminous.

Type
4. Abstracts of Poster Papers
Information
International Astronomical Union Colloquium , Volume 111: The Use of Pulsating Stars in Fundamental Problems of Astronomy , 1989 , pp. 272
Copyright
Copyright © Cambridge University Press 1989