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A Study of Convection with δ Scuti Stars in Open Clusters: the Pleiades

Published online by Cambridge University Press:  12 April 2016

J.-C. Suárez ,
E. Michel ,
G. Houdek ,
Y. Lebreton  and
F. Pérez Hernández
J.-C. Suárez
Affiliation:
Observatoire de Paris-Meudon, DASGAL, UMR 8633, F-92195 Meudon, France
E. Michel
Affiliation:
Observatoire de Paris-Meudon, DASGAL, UMR 8633, F-92195 Meudon, France
G. Houdek
Affiliation:
I.A., University of Cambridge, Cambridge, U.K.
Y. Lebreton
Affiliation:
Observatoire de Paris-Meudon, DASGAL, UMR 8633, F-92195 Meudon, France
F. Pérez Hernández
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain

Abstract

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In this work we propose a preliminary seismic investigation of δ Scuti stars in the Pleiades cluster, focusing on potential diagnostics of convection and core-overshooting. Taking into account the effect of fast rotation in the modelling, we compare observed frequencies for 4 δ Scuti stars with radial linear instability predictions. A satisfying agreement is reached between the predicted ranges of unstable modes and those derived from observations for “low-mass” stars (∼ 1.55M⊙). However, a strong disagreement is found for “high-mass” stars (∼ 1.77M⊙), whatever the mixing length (α) value. These results are compared with previous ones obtained for Praesepe.

Type
Part 4. The Interaction between Convection and Pulsation
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 490 - 493
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

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