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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*
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, 119017, Moscow, Russia email: msachkov@inasan.ru
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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013