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Nonlinear Models of Miras, Including Time-Dependent Convection

Published online by Cambridge University Press:  15 February 2018

Dale A. Ostlie  and
Arthur N. Cox
Dale A. Ostlie
Affiliation:
Dept. of Physics, Weber State University, Ogden, UT 84408-2508
Arthur N. Cox
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545

Abstract

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Nonlinear calculations of Mira variable stars of Population I are presented. Each model is 1 M⊙, with a luminosity of 5000 L⊙ and an effective temperature near 3000 K. These models incorporate our theory of time-dependent convection, which is based on a convective phase lag formalism and includes spatial averaging of convective eddies from adjacent zonal interfaces. The theory also includes turbulent pressure, energy, and viscosity terms and allows for negative convective luminosities in subadiabatic regions where overshooting occurs.

Results of the present study suggest that based upon the dynamic behavior of the models, fundamental mode pulsations are the preferred mode of oscillation. In particular, we do not obtain the chaotic behavior that has been noted in previous nonlinear studies of the fundamental mode oscillations of Miras.

Type
Beyond the Classical Instability Strip
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 208
Copyright
Copyright © Cambridge University Press 1993