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Turbulence-Driven Atmospheric Instability and Large-Scale Motions in Super- and Hypergiants

Published online by Cambridge University Press:  12 April 2016

B. Boer ,
J. Carpay ,
A. de Koter ,
C. de Jager ,
H. Nieuwenhuijzen ,
A. Piters  and
F. Spaan
B. Boer
Affiliation:
Astronomical Observatory and Laboratory for Space Research, Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
J. Carpay
Affiliation:
Astronomical Observatory and Laboratory for Space Research, Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
A. de Koter
Affiliation:
Astronomical Observatory and Laboratory for Space Research, Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
C. de Jager
Affiliation:
Astronomical Observatory and Laboratory for Space Research, Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
H. Nieuwenhuijzen
Affiliation:
Astronomical Observatory and Laboratory for Space Research, Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
A. Piters
Affiliation:
Astronomical Observatory and Laboratory for Space Research, Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
F. Spaan
Affiliation:
Astronomical Observatory and Laboratory for Space Research, Beneluxlaan 21, 3527 HS Utrecht, The Netherlands

Abstract

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Spectral studies of super- and hypergiants show that the (outward directed) turbulent acceleration approaches the value of the gravitational acceleration for the most luminous stars, which makes their atmospheres unstable.

Type
Part II. Mass-Losing Stars in Different Stages of Evolution
Information
International Astronomical Union Colloquium , Volume 108: Atmospherics Diagnostics of Stellar Evolution: Chemical Peculiarity, Mass Loss, and Explosion , 1988 , pp. 131 - 132
Copyright
Copyright © Springer-Verlag 1988

References

Blackwell, D.E., Shallis, M.J.: 1977, Monthly Not. R. Astron. Soc. 180, 177.Google Scholar
Boer, B., De Jager, C., Nieuwenhuijzen, H.: 1988, Astron. Astrophys. (submitted 1987).Google Scholar
De Jager, C.: 1984, Astron. Astrophys. 138, 246.Google Scholar