Reference : Convection-pulsation coupling. II. Excitation and stabilization mechanisms in delta S...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/75426
Convection-pulsation coupling. II. Excitation and stabilization mechanisms in delta Sct and gamma Dor stars
English
Dupret, Marc-Antoine [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique >]
Grigahcène, A. [Instituto de Astrofísica de Andalucía-CSIC, Apartado 3004, 18080 Granada, Spain]
Garrido, R. [Instituto de Astrofísica de Andalucía-CSIC, Apartado 3004, 18080 Granada, Spain]
Gabriel, Maurice [> > Département d'astrophys., géophysique et océanographie (AGO) >]
Scuflaire, Richard [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA) >]
1-Jun-2005
Astronomy and Astrophysics
EDP Sciences
435
927-939
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] stars: oscillations ; convection ; stars: interiors ; stars: variables: delta Sct ; stars: variables: general
[en] We apply here the Time Dependent Convection (TDC) treatment presented in our earlier paper in this series to the study of delta Sct and gamma Dor pulsating stars. Stabilization of the delta Sct p-modes at the red edge of the Instability Strip (IS) and the driving of the gamma Dor g-modes are explained by our models. Theoretical IS obtained with different values of the Mixing Length (ML) parameter alpha are compared to observations and a good agreement is obtained for alpha between 1.8 and 2. The influence of each term of our TDC treatment (perturbation of convective flux, turbulent pressure, and turbulent kinetic energy dissipation) on the eigenfrequencies and on the driving and damping mechanisms is investigated. Finally, we show that our TDC models predict the likely existence of hybrid stars with both delta Sct p-modes and gamma Dor g-modes oscillations.
http://hdl.handle.net/2268/75426
10.1051/0004-6361:20041817
http://adsabs.harvard.edu/abs/2005A%26A...435..927D

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