2010A&A...512A..33L -
Astronomy and Astrophysics, volume 512, A33-33 (2010/3-1)
Mass fluxes for hot stars.
LUCY L.B.
Abstract (from CDS):
In an attempt to understand the extraordinarily small mass-loss rates of late-type O dwarfs, mass fluxes in the relevant part of (T
eff, g)-space are derived from first principles using a previously-described code for constructing moving reversing layers. From these mass fluxes, a weak-wind domain is identified within which a star's rate of mass loss by a radiatively-driven wind is less than that due to nuclear burning. The five weak-wind stars recently analysed by Marcolino et al. (
2009A&A...498..837M) fall within or at the edge of this domain. But although the theoretical mass fluxes for these stars are ≃1.4dex lower than those derived with the formula of Vink et al. (
2000A&A...362..295V), the observed rates are still not matched, a failure that may reflect our poor understanding of low-density supersonic outflows. Mass fluxes are also computed for two strong-wind O4 stars analysed by Bouret et al. (
2005A&A...438..301B). The predictions agree with the sharply reduced mass loss rates found when Bouret et al. take wind clumping into account.
Abstract Copyright:
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Journal keyword(s):
stars: early-type - stars: mass-loss - stars: winds, outflows
Simbad objects:
9
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