convection; stars: interiors; stars: oscillations; stars: variables: other
Abstract :
[en] We apply for the first time the time-dependent convection (TDC) treatment of Gabriel and Grigahcène et al. to the photometric mode identification in gamma Doradus (gamma Dor) stars. We consider the influence of this treatment on the theoretical amplitude ratios and phase differences. Comparison with the observed amplitudes and phases of the stars gamma Dor, 9 Aurigae, HD 207223 = HR 8330, HD 12901 and 48501 is presented and enables us to identify the degree l of the pulsation modes for four of them. We also determine the mode stability for different models of these stars. We show that our TDC models agree better with observations than with frozen convection models. Finally, we compare the results obtained with different values of the mixing-length parameter alpha.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Dupret, Marc-Antoine ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique
Grigahcène, A.; Instituto de Astrofísica de Andalucía-CSIC, Apartado 3004, 18080 Granada, Spain ; CRAAG - Algiers Observatory BP 63 Bouzareah 16340, Algiers, Algeria
Garrido, R.; Instituto de Astrofísica de Andalucía-CSIC, Apartado 3004, 18080 Granada, Spain
De Ridder, J.; Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium
Scuflaire, Richard ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA)
Gabriel, Maurice ; Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
Time-dependent convection seismic study of five gamma Doradus stars
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