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Non-Adiabatic Seismic Study of The Thin Convective Envelope of δ Scuti Stars

  • M.-A. Dupret (a1), A. Grigahcène (a1), R. Garrido (a1), J. Montalban (a2), M. Gabriel (a2) and R. Scuflaire (a2)...

Abstract

For δ Sct stars, the theoretical predictions of a non-adiabatic pulsation code are very dependent on the characteristics of the thin convective envelope of the models (Balona & Evers 1999). The treatment of the non-adiabatic interaction between convection and pulsation also has a significant impact on the results, particularly near the red edge of the instability strip. The non-adiabatic theoretical predictions can be tested upon observations by comparing them to the amplitude ratios and phase differences as observed in different color passbands (Dupret et al. 2003). In the first part of this paper, we compare the results obtained by adopting different treatments of convection in the interior and atmosphere models: mixing-length theory (MLT) and full spectrum of turbulence (FST) (Canuto et al. 1996, CGM). In the second part, we examine the problem of the interaction between convection and pulsation and compare the mode stability obtained with and without including time-dependent convection in our non-adiabatic code.

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Copyright

References

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Balona, L.A., Evers, E.A. 1999 MNRAS, 302, 349
Barban, C., Goupil, M.J., Van’t Veer-Menneret, C., Garrido, R., Kupka, F., Heiter, U. 2003 A&A, 405, 1095
Canuto, V.M., Goldman, L. Mazzitelli, I. 1996 ApJ, 473, 550 (CGM)
Dupret, M.-A., De Ridder, J., Neuforge, C., Aerts, C., Scuflaire, R. 2002 A&A, 385, 563
Dupret, M.-A., De Ridder, J., De Cat, P., Aerts, C., Scuflaire, R., Noels, A., Thoul, A. 2003 A&A, 398, 677
Gabriel, M. 1996 Bull. Astr. Soc. India, 24, 233
Gough, D.O. 1977 ApJ, 214, 196
Heiter, U., Kupka, F., van’t Veer-Menneret, C, Barban, C., et al. 2002 A&A, 392, 619
Kurucz, R.L. 1993 ATLAS9 Stellar Atmosphere programs and 2 km/s grids. Kurucz CDROM No 13

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