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Unsolved Problems in Stellar Pulsation Physics

Published online by Cambridge University Press:  12 April 2016

Arthur N. Cox
Arthur N. Cox*
Affiliation:
Los Alamos Astrophysics, Los Alamos National Laboratory, e-mail:anc@lanl.gov

Abstract

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Unsolved problems of theoretical stellar pulsations are briefly reviewed for pulsators in six regions of the Hertzsprung-Russell diagram. Only a small selection is included in the discussion of them, and the emphasis is mostly on theoretical problems. The problem of the pulsations of Mira stars, and the mode in which it pulsates is reviewed in more detail together with some new calculations that illustrate the difficulties. Finally an extensive discussion is made for the pulsation mechanism of the white dwarf (DA and DB) pulsators. A new interpretation is advocated, which unfortunately is not tractable by linear nonadiabatic calculations because during the pulsation cycle it involves the turning off and on of Convection with a short time scale relative to the pulsation period. Most of the theoretical problems involve the time dependence of convection, a topic still without any concise and practical way of convenient implementation.

Type
Part 1. Stellar Pulsation in a Broad Context
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 21 - 34
Copyright
Copyright © Astronomical Society of the Pacific 2002

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