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The Period-Radius Relation: Classical Cepheids and RR Lyrae stars

Published online by Cambridge University Press:  12 April 2016

M. Marconi ,
G. Bono  and
T.E. Nordgren
M. Marconi
Affiliation:
INAF-Astronomical Observatory of Capodimonte, Via Moiariello 16, 80131 Naples, Italy
G. Bono
Affiliation:
INAF-Astronomical Observatory of Rome, Via Frascati 33, 0040 Monte Porzio Catone, Italy
T.E. Nordgren
Affiliation:
Department of Physics, University of Redlands, 1200 East Colton Avenue, Redlands, CA 92373, USA

Abstract

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We present the period-radius relations predicted by nonlinear convective models of Classical Cepheids and RR Lyrae stars. For the former variables we show that the metallicity effect is negligible for both fundamental and first overtone pulsators. This confirms the power of the period-radius relation to estimate Cepheid radii and in turn distances. For the latter class of variables we show that the dispersion of the period-radius relation of both fundamental and first overtone pulsators is significantly reduced once the metallicity dependence is taken into account. This provides a robust method to evaluate the radius of observed RR Lyrae with measured period and metal abundance.

Type
Part 9. Evolutionary and pulsation properties of variable stars
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 502 - 505
Copyright
Copyright © Astronomical Society of the Pacific 2004

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