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The period–radius relation of classical Cepheids and the problem of their mode identification

Published online by Cambridge University Press:  26 February 2013

Mikhail Sachkov
Mikhail Sachkov*
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, 119017, Moscow, Russia email: [email protected]
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Abstract

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Based on radial-velocity measurements and photometric observations, we calculated the radii of around 200 classical Cepheids that were previously assumed to be fundamental-mode pulsators. Our detailed analysis of the period–radius diagram shows that the sample of Cepheids with pulsation periods shorter than 9 days probably contains a significant fraction (up to 30%) of stars pulsating in the first overtone.

Keywords

stars: fundamental parametersstars: pulsationsCepheids
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 187
Copyright
Copyright © International Astronomical Union 2013