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Revision of the [Fe/H] – φ31 – P relationship for RRc variables

Published online by Cambridge University Press:  18 February 2014

Siobahn Morgan
Siobahn Morgan*
Affiliation:
Department of Earth Science, University of Northern Iowa, Cedar Falls Iowa, USA email: [email protected]
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Abstract

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The relationship derived by Morgan et al. (2007) for type-c RR Lyrae variables (RRc) between values of [Fe/H] – φ31 – P has been revised and expanded. New relationships are based upon Fourier coefficients of 163 RRc variables in 19 Galactic globular clusters using the metallicity scales of Harris (2010), Zinn & West (1984) and Carretta et al. (2009). This larger database includes more low-metallicity clusters ([Fe/H] < −2.0), and the best fitting relations are found to depend upon values of log P rather than P. The new relations are applied to various populations of RRc including Milky Way field variables, LMC globular clusters variables, ω Cen RRc, and RRc in various OGLE III databases.

Keywords

stars: abundancesstars: variables: other
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 461 - 462
Copyright
Copyright © International Astronomical Union 2014 

References

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