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Atmospheric dynamics of luminous stars

Published online by Cambridge University Press:  12 April 2016

Cornells de Jager ,
Joost Carpay ,
Alex de Koter ,
Hans Nieuwenhuijzen  and
Erik Schellekens
Cornells de Jager
Affiliation:
Laboratory for Space Research and Astronomical InstituteBeneluxlaan 21, 3527 HS UTRECHT, The Netherlands
Joost Carpay
Affiliation:
Laboratory for Space Research and Astronomical InstituteBeneluxlaan 21, 3527 HS UTRECHT, The Netherlands
Alex de Koter
Affiliation:
Laboratory for Space Research and Astronomical InstituteBeneluxlaan 21, 3527 HS UTRECHT, The Netherlands
Hans Nieuwenhuijzen
Affiliation:
Laboratory for Space Research and Astronomical InstituteBeneluxlaan 21, 3527 HS UTRECHT, The Netherlands
Erik Schellekens
Affiliation:
Laboratory for Space Research and Astronomical InstituteBeneluxlaan 21, 3527 HS UTRECHT, The Netherlands

Abstract

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A review is given of data and theories on the motion fields in super and hypergiants with special reference to LBV’s. We show that the radiative momentum flux is incapable of driving the episodical bursts of mass loss of these stars, and that there are several indications that the LBV-phenomenon is hydrodynamically driven. The sum of turbulent and radiative accelerations in the atmospheres of the most luminous stars compensates the gravitational acceleration for stars near the Humphreys-Davidson limit. This explains their atmospheric near-instability. The motion field in the atmosphere of a typical LBV consists mainly of low-order gravity waves, while acoustic waves are rapidly damped. These gravitation waves may be stochastic rather than coherently ordered. These stochastic pulsations are assumed to be responsible for the LBV phenomenon.

Type
Section I: Main Papers, General Discussions, and Two Panel Discussions
Information
International Astronomical Union Colloquium , Volume 113: Physics of Luminous Blue Variables , 1989 , pp. 211 - 220
Copyright
Copyright © Kluwer 1989

References

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