Hostname: page-component-848d4c4894-pjpqr Total loading time: 0 Render date: 2024-06-17T08:04:36.967Z Has data issue: false hasContentIssue false
  • English
  • Français

Nonlinear Radial Pulsations for Hot 20-M⊙ Models

Published online by Cambridge University Press:  12 April 2016

Benjamin A. Austin ,
Joyce A. Guzik ,
Kate M. Despain  and
Matthew R. Templeton
Benjamin A. Austin
Affiliation:
Los Alamos National Laboratory, X-2, MS T085, Los Alamos, NM 87545-2345, USA
Joyce A. Guzik
Affiliation:
Los Alamos National Laboratory, X-2, MS T085, Los Alamos, NM 87545-2345, USA
Kate M. Despain
Affiliation:
Los Alamos National Laboratory, X-2, MS T085, Los Alamos, NM 87545-2345, USA
Matthew R. Templeton
Affiliation:
American Association of Variable Star Observers, 25 Birch St., Cambridge, MA 02138, USA

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We present the results of calculations that predict a radial pulsation instability region for hot 20-M⊙ stars within a narrow band around Teff = 22,000 K. These models have exhausted core hydrogen and are undergoing shell hydrogen burning, and have luminosities similar to the most massive β Cephei stars, but are slightly cooler and more evolved. The pulsations grow to a radial velocity amplitude of ~20 km s-1with a period of ~0.75 d. The amplitude increases for higher Z and lower Y models.

Type
Part 8. New theoretical developments in stellar pulsation and variability
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 453 - 457
Copyright
Copyright © Astronomical Society of the Pacific 2004

References

Cox, A.N. 1990, in Nonlinear Astrophysical Fluid Dynamics, eds Buchler, J.R. & Gottesman, S.T., Annals N.Y. Acad. Sci., Vol. 617, 54 CrossRefGoogle Scholar
Cox, A.N. 1983, in Astrophysical Processes in Upper Main Sequence Stars, The 13th Advanced Course of the Swiss Society of Astronomy and Astrophysics, eds Hauck, B. & Maeder, A. (Geneva Observatory), 72 Google Scholar
Guzik, J.A., Swenson, F.J. 1997 ApJ, 491, 967 Google Scholar
Iben, I. 1963 ApJ, 138, 452 CrossRefGoogle Scholar
Iben, I. 1965a ApJ, 141, 993 CrossRefGoogle Scholar
Iben, I. 1965b ApJ, 142, 1447 Google Scholar
Iglesias, CA., Rogers, F.J. 1996 ApJ, 464, 943 Google Scholar
Ostlie, D.A. 1990, in Numerical Modelling of Nonlinear Stellar Pulsations: Problems and Prospects, ed. Buchler, J.R. (Dordrecht: Kluwer), 89 CrossRefGoogle Scholar
Ostlie, D.A., Cox, A.N. 1993 Ap&SS, 210, 311 Google Scholar
Pamyatnykh, A.A. 2002 Comm. Asteroseismology, 142, 10 Google Scholar
Pesnell, W.D. 1990 ApJ, 363, 227 Google Scholar
Templeton, M.R., Bradley, P.A., Guzik, J.A. 2000 ApJ, 528, 979 CrossRefGoogle Scholar