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RR Lyrae in M15: Fourier Decomposition and Physical Parameters

Published online by Cambridge University Press:  09 August 2007

G. García Lugo ,
A. Arellano Ferro  and
Patricia Rosenzweig
G. García Lugo
Affiliation:
Grupo para la Enseñanza y el Aprendizaje de las Ciencias, Depto. de Pedagogía y Didáctica, Facultad de Humanidades y Educación, Universidad de Los Andes, Mérida, Venezuela
A. Arellano Ferro
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, D.F.
Patricia Rosenzweig
Affiliation:
Grupo de Astrofísica Teórica, Depto. de Física, Facultad de Ciencias, Núcleo La Hechicera, Universidad de Los Andes, Mérida, Venezuela email: [email protected]
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Abstract

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The V and R light curves for 30 RR Lyrae stars in M15 were used to calculate their physical parameters. The Blazhko effect, previously reported in V12, was not detected. The determined values of the iron content and distance of the cluster are: [Fe/H] = −1.98 ± 0.24 and d = 8.67 ± 0.41 kpc, respectively. The mean values of the physical parameters determined for the RR Lyrae stars place the cluster precisely into the sequences Oosterhoff type – metallicity and metallicity – effective temperature, valid for globular clusters.

Keywords

Globular Clusters-M15Variable Stars-RR Lyrae
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 605 - 612
Copyright
Copyright © International Astronomical Union 2007

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