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Theses

Astérosismologie des étoiles ZZ Ceti

Abstract : This thesis shows how far asteroseismological techniques, relying on observation and modeling, allow to derive the structural properties of a DAV white dwarf, especially how it becomes possible to deduce the mass of the remaining hydrogen envelope in the star. Two ZZ Ceti stars were studied: HL Tau 76 (located on the red edge of the instability strip) and G 185-32 (on the blue edge). Modeling indicates that the hydrogen envelopes in these stars have nearly the same mass: $M(H)= 2.0(+/-0.3)x 10e-4 Mstar. This result may suggest a possible constancy for the hydrogen layer mass among the DA stars class and consequently prospective constraints for cosmochronology and stellar evolution. Moreover, this thesis illustrates how far modeling might reveal some physical features such as a non-uniform stellar rotation, a non-linear coupling between resonant modes, an interaction between pulsations and convection.
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https://tel.archives-ouvertes.fr/tel-00010095
Contributor : David Pech <>
Submitted on : Friday, September 9, 2005 - 9:00:51 PM
Last modification on : Monday, October 19, 2020 - 10:54:11 AM
Long-term archiving on: : Friday, September 14, 2012 - 2:15:23 PM

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  • HAL Id : tel-00010095, version 1

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David Pech. Astérosismologie des étoiles ZZ Ceti. domain_other. Université Paul Sabatier - Toulouse III, 2005. Français. ⟨tel-00010095⟩

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