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New Nonlinear Model for the Long-Periodic Puzzling Cepheid l Car: Theory vs. Observations

Published online by Cambridge University Press:  15 August 2009

M. Goupil ,
Z. Kolláth ,
N. Nardetto ,
P. Kervella ,
A. Fokin ,
N. Nardetto  and
Ph. Mathias
A. Fokin*
Affiliation:
Institute of Astronomy of the Russian Academy of Sciences, 48 Pjatnitskaya Str., Moscow 109017, Russia
N. Nardetto
Affiliation:
Observatoire de la Côte d'Azur, Dpt. Gemini, UMR 6203, 06304 Nice Cedex 4, France
Ph. Mathias
Affiliation:
Observatoire de la Côte d'Azur, Dpt. Gemini, UMR 6203, 06304 Nice Cedex 4, France
*
fokin@inasan.ru
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Abstract

A nonlinear radiative pulsating model for the long-periodic Cepheid l Carinae is presented. The LTE metallic lines and non-LTE hydroen lines are calculated and compared with the HARPS observations. We found that the weak and medium metallic lines well correspond to the radial Cepheid pulsation, while the Hα and some other strong lines reveal very strange behaviour which is not consistent with usual Cepheid pulsation. We conclude that l Car must have an extended circumstellar envelope, and discuss its possible parameters.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 38: Nonlinear Pulsations and Hydrodynamics of Cepheids , 2009 , pp. 151 - 156
Copyright
© EAS, EDP Sciences, 2009

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References

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