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Effect of convection modeling on the non-adiabatic seismic observables of δ Scuti stars

Published online by Cambridge University Press:  01 August 2006

Josefina Montalbán  and
Marc-Antoine Dupret
Josefina Montalbán
Affiliation:
Institut d'Astrophysique et Géophysique, Université de Liège, 4000- Liége, Belgium email: [email protected]
Marc-Antoine Dupret
Affiliation:
Observatoire de Paris, LESIA, CNRS UMR 8109, 92195 MeudonFrance email:[email protected]
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Abstract

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Pulsation frequencies in δ Scuti stars do not fall in the asymptotic domain, therefore, multi-band photometric methods are currently used to identify the pulsation modes. Theoretical photometric amplitude ratios and phase differences between photometric bands depend, however, on the treatment of convection in surface stellar layers. In this poster we present the results of applying the non-adiabatic analysis by Dupret et al. (2003) to δ Scuti stellar models computed by using the FST (Canuto et al. 1996, CGM) treatment of convection in the interior and in the atmosphere. We determine the amplitude ratios and phase difference for several bands in the Strömgren photometric system, and we compare the results obtained with the FST treatment and with the classical Mixing-length theory. We show that the differences in the external thermal structure are clearly reflected in the photometric phase differences.

Keywords

Convectionstars: oscillationsstars: variables: δ Scuti
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 385 - 387
Copyright
Copyright © International Astronomical Union 2007

References

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