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Applications of Non-Adiabatic Radial Pulsation Equations to roAp Stars

Published online by Cambridge University Press:  12 April 2016

R. Medupe ,
J. Christensen-Dalsgaard  and
D.W. Kurtz
R. Medupe
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa Department of Physics, University of North West, Mmabatho 2735, South Africa Department of Astronomy, University of Cape Town, Rondebosch 7701, South Africa
J. Christensen-Dalsgaard
Affiliation:
Teoretisk Astrofysik Center, Aarhus Universitet, DK-8000 Aarhus C, Denmark
D.W. Kurtz
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK

Abstract

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We apply a code that solves grey radial non-adiabatic pulsation equations with consistent treatment of radiative transfer to the roAp frequency regime. We find evidence for the existence of chromospheric modes at frequencies 2.5 mHz, 3.7 mHz, 4.6 mHz and 5.7 mHz in the equilibrium model we used. We also find that, since the oscillations are not adiabatic at the surfaces of roAp stars, better surface boundary conditions need to be considered in future studies.

Type
Part 2.3. Chemically Peculiar Stars
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 296 - 299
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

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