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Non-adiabatic pulsations in delta Scuti stars
Moya, A.; Garrido, R.; Dupret, Marc-Antoine
2004In Stellar Structure and Habitable Planet Finding
 

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Keywords :
Stars: Delta Scuti; Stars: Atmospheres; Stars: Oscillations
Abstract :
[en] For delta Scuti stars, phase differences and amplitude ratios between the relative effective temperature variation and the relative radial displacement can be derived from multicolor photometric observations. The same quantities can be also calculated from theoretical non-adiabatic pulsation models. We present here these theoretical results, which indicate that non-adiabatic quantities depend on the mixing length parameter alpha used to treat the convection in the standard Mixing Length Theory (MLT). This dependence can be used to test and to constrain, through multicolor observations, the way MLT describes convection in the outermost layers of the star. We will use the equilibrium models provided by the CESAM evolutionary code. The pulsational observables are calculated by using a non-adiabatic pulsation code developed by R. Garridon and A. Moya. In the evolutionary and pulsation codes, a complete reconstruction of the non-grey atmosphere (Kurucz models) is included. The interaction between pulsation and atmosphere, as described by Dupret et al. (2002), is also included in the code.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Moya, A.
Garrido, R.
Dupret, Marc-Antoine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique
Language :
English
Title :
Non-adiabatic pulsations in delta Scuti stars
Publication date :
01 January 2004
Audience :
International
Main work title :
Stellar Structure and Habitable Planet Finding
ISBN/EAN :
92-9092-848-4
Pages :
365-368
Commentary :
538 ISBN: <ISBN>92-9092-848-4</ISBN>
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