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Mixing in the SMC Stars: Implication for Cepheids

Published online by Cambridge University Press:  12 April 2016

D. Cordier ,
T. Lejeune ,
Y. Lebreton  and
M.-J. Goupil
D. Cordier
Affiliation:
DASGAL, Observatoire de Paris-Meudon, Meudon, France and Astronomisches Institut der Universität Basel, Binningen, Switzerland
T. Lejeune
Affiliation:
DASGAL, Observatoire de Paris-Meudon, Meudon, France and Astronomisches Institut der Universität Basel, Binningen, Switzerland
Y. Lebreton
Affiliation:
DASGAL, Observatoire de Paris-Meudon, Meudon, France and Astronomisches Institut der Universität Basel, Binningen, Switzerland
M.-J. Goupil
Affiliation:
DASGAL, Observatoire de Paris-Meudon, Meudon, France and Astronomisches Institut der Universität Basel, Binningen, Switzerland

Abstract

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We compare the recent OGLE 2 data of stars in the Small Magellanic Cloud (SMC) with stellar evolutionary models of low metallicity computed with the updated and numerically accurate code CESAM. The conversion between theoretical and observational data has been carefully done using the BaSel Library. This enables us to derive new observational constraints at SMC chemical composition: on the overshooting parameter αover during the main sequence, and on the mixing-length parameter αMLT for the red giant branch. The occurrence of an instability strip-crossing episode is strongly related to these mixing parameters.

Type
Part 5. Theoretical Models of Classical Pulsating Stars
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 381 - 382
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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