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Nonradial Oscillations in Cepheids

Published online by Cambridge University Press:  15 August 2009

M. Goupil ,
Z. Kolláth ,
N. Nardetto ,
P. Kervella ,
C. Mulet-Marquis ,
W. Glatzel ,
I. Baraffe  and
C. Winisdoerffer
C. Mulet-Marquis
Affiliation:
CRAL, CNRS, UMR 5574, École Normale Supérieure, 46 allée d'Italie, 69007 Lyon, France
W. Glatzel
Affiliation:
Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
I. Baraffe
Affiliation:
CRAL, CNRS, UMR 5574, École Normale Supérieure, 46 allée d'Italie, 69007 Lyon, France
C. Winisdoerffer
Affiliation:
CRAL, CNRS, UMR 5574, École Normale Supérieure, 46 allée d'Italie, 69007 Lyon, France
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Abstract

We analyse the presence of nonradial oscillations in Cepheids, a problem that has not been theoretically revised since the work of Dziembowsky (1977, Acta Astron., 27, 95) and Osaki (1977, Publ. Astron. Soc. Japan, 29, 235). Our analysis is motivated by a work of Moskalik et al. (2004, ASPC, 310, 498), which reports the detection of low-amplitude periodicities in a few Cepheids of the large Magellanic cloud. These newly discovered periodicities were interpreted as nonradial modes.
Based on linear nonadiabatic stability analysis, our goal is to reanalyse the presence and stability of nonradial modes, taking into account improvement in the main input physics required for the modelling of Cepheids.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 38: Nonlinear Pulsations and Hydrodynamics of Cepheids , 2009 , pp. 115 - 122
Copyright
© EAS, EDP Sciences, 2009

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References

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Lee, U., 1985, PASJ, 37, 279
Moskalik, P., Kolaczkowski, Z., & Mizerski, T., 2004, ASPC, 310, 498
Osaki, Y., 1977, Publ. Astron. Soc. Japan, 29, 235
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