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Driving g-Mode Pulsation in γ Doradus Variables

Published online by Cambridge University Press:  12 April 2016

Yanqin Wu
Yanqin Wu*
Affiliation:
CITA, University of Toronto, Toronto, CANADA

Abstract

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Surface convection zones in γ Doradus variables (early F-type g-mode pulsators) can drive pulsation via the ‘convective driving’ mechanism. This mechanism is first proposed and studied in the context of ZZ Cetis (hydrogen-envelope white dwarfs with g-mode pulsations) by Brickhill (1991) and Goldreich & Wu (1999). We implement and develop the convective driving theory to suit the environments on γ Dors, in particular, stronger super-adiabatic gradient and weaker convective flux than those in white dwarfs. This results in a spectrum of gravity-modes being excited in the observed temperature range. However, there are more remaining problems than those that are solved.

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. 506 - 507
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Brickhill, A.J. 1991, MNRAS, 251, 673 CrossRefGoogle Scholar
Goldreich, P. & Wu, Y. 1999, ApJ, 511, 904 CrossRefGoogle Scholar
Guzik, J.A., Kaye, A.B., Bradley, P.A., Cox, A.N., & Neuforge, C. 2000, Apj, 542, L57 CrossRefGoogle Scholar