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New insights on the interior of solar-like pulsators thanks to CoRoT: the case of HD 49385

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Abstract

The high performance photometric data obtained with space mission CoRoT offer the opportunity to efficiently constrain our models for the stellar interior of solar-like pulsating stars. On the occasion of the analysis of the oscillations of solar-like pulsator HD 49385, a G0-type star in an advanced stage of evolution, we revisit the phenomenon of the avoided crossings. Christensen-Dalgaard proposed a simple analogy to describe an avoided crossing between two modes. We here present an extension of this analogy to the case of n modes, and show that it should lead, in certain cases, to a characteristic behavior of the eigenfrequencies, significantly different from the n=2 case. This type of behavior seems to be observed in HD 49385, from which we infer that the star should be in a Post Main Sequence phase.

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Authors and Affiliations

  1. LESIA, CNRS UMR 8109, Observatoire de Paris, Université Paris 6, Université Paris 7, 92195, Meudon cedex, France

    S. Deheuvels & E. Michel

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  1. S. Deheuvels
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  2. E. Michel
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Correspondence to S. Deheuvels.

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Deheuvels, S., Michel, E. New insights on the interior of solar-like pulsators thanks to CoRoT: the case of HD 49385. Astrophys Space Sci 328, 259–263 (2010). https://doi.org/10.1007/s10509-009-0216-2

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  • DOI: https://doi.org/10.1007/s10509-009-0216-2

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