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A Proposed Pulsation Driving Mechanism for γ Doradus Variable Stars

Published online by Cambridge University Press:  12 April 2016

J.A. Guzik ,
A.B. Kaye ,
P.A. Bradley ,
A.N. Cox ,
C. Neuforge-Verheecke  and
P.B. Warner
J.A. Guzik*
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545-2345, USA
A.B. Kaye
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545-2345, USA
P.A. Bradley
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545-2345, USA
A.N. Cox
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545-2345, USA
C. Neuforge-Verheecke
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545-2345, USA
P.B. Warner
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545-2345, USA
*
1 e-mail: joy@lanl.gov

Abstract

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We propose a pulsation driving mechanism for γ Doradus variable stars. This mechanism requires that the local convective timescale at the base of the envelope convection zone be comparable to or longer than the pulsation period. This mechanism explains both the red and blue edges of the γ Dor instability strip. We predict that some candidate γ Dor stars summarized by Handler (1999) may actually be too hot or too cool to be γ Dor variables.

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. 502 - 505
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

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