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2009MNRAS.394..595V - Mon. Not. R. Astron. Soc., 394, 595-604 (2009/April-1)
On the behaviour of stellar winds that exceed the photon-tiring limit.
VAN MARLE A.J., OWOCKI S.P. and SHAVIV N.J.
Abstract (from CDS):
This paper investigates the time-dependent behaviour of stellar winds that exceed the photon-tiring limit, using one-dimensional numerical simulations of a porosity-moderated, continuum-driven stellar wind. We find that the regions close to the star show a hierarchical pattern of high-density shells moving back and forth, unable to escape the gravitational potential of the star. At larger distances, the flow eventually becomes uniformly outward, though still quite variable. Typically, these winds have a very high density but a terminal flow speed well below the escape speed at the stellar surface. Since most of the radiative luminosity of the star is used to drive the stellar wind, such stars would appear much dimmer than expected from the super-Eddington energy generation at their core. The visible luminosity typically constitutes less than half of the total energy flow and can become as low as 10 per cent or less for those stars that exceed the photon-tiring limit by a large margin.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): hydrodynamics - radiative transfer - methods: numerical - stars: mass-loss - stars: winds, outflows
Simbad objects: 2
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