Reference : Effect of convective outer layers modeling on non-adiabatic seismic observables of de...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/75438
Effect of convective outer layers modeling on non-adiabatic seismic observables of delta Scuti stars
English
Montalban Iglesias, Josefa mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Dupret, Marc-Antoine [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique >]
1-Aug-2007
Astronomy and Astrophysics
EDP Sciences
470
991-1002
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] convection ; stars: atmospheres ; stars: oscillations ; stars: variables: delta Scuti ; stars: evolution
[en] Context: The identification of pulsation modes in delta Scuti stars is mandatory for constraining the theoretical stellar models. The non-adiabatic observables used in the photometric identification methods depend, however, on convection modeling in the external layers. Aims: We determine how the treatment of convection in the atmospheric and sub-atmospheric layers affects the mode identification and what information about the thermal structure of the external layers can be obtained from amplitude ratios and phase lags in Strömgren photometric bands. Methods: We derive non-adiabatic parameters for delta Scuti stars by using, for the first time, stellar models with the same treatment of convection in the interior and in the atmosphere. We compute classical non-gray mixing length models, and as well non-gray ``full spectrum of turbulence'' (FST) models. Furthermore, we compute the photometric amplitudes and phases of pulsation by using the colors and the limb-darkening coefficients as derived from the same atmosphere models as used in the stellar modeling. Results: We show that the non-adiabatic phase-lag is mainly sensitive to the thermal gradients in the external layers, hence to the treatment of convection, and that this sensitivity is also clearly reflected in the multi-color photometric phase differences.
http://hdl.handle.net/2268/75438
10.1051/0004-6361:20066699
http://adsabs.harvard.edu/abs/2007A%26A...470..991M
http://de.arxiv.org/abs/astro-ph/0703400

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