2005A&A...442..587V


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET21:47:54

2005A&A...442..587V - Astronomy and Astrophysics, volume 442, 587-596 (2005/11-1)

On the metallicity dependence of Wolf-Rayet winds.

VINK J.S. and DE KOTER A.

Abstract (from CDS):

We have performed a pilot study of mass loss predictions for late-type Wolf-Rayet (WR) stars as a function of metal abundance, over a range between 10–5≤(Z/Z)≤10. We find that the winds of nitrogen-rich Wolf-Rayet stars are dominated by iron lines, with a dependence of mass loss on Z similar to that of massive OB stars. For more evolved, carbon-rich, WR stars the wind strength is also found to be dependent on the Fe abundance, so that they depend on the chemical environment of the host galaxy, but with a mass loss metallicity dependence that is less steep than for OB stars. Our finding that WR mass loss is Z-dependent is a new one, with important consequences for black hole formation and X-ray population studies in external galaxies. A further finding of our study is that the Z dependence of C-rich WR stars becomes weaker at metallicities below Z/Z≲1/10, and mass loss no longer declines once the metal abundance drops below (Z/Z)≃10–3. This is the result of an increased importance of radiative driving by intermediate mass elements, such as carbon. In combination with rapid rotation and/or proximity to the Eddington limit - likely to be relevant for massive Population iii stars - this effect may indicate a role for mass loss in the appearance and evolution of these objects, as well as a potential role for stellar winds in enriching the intergalactic medium of the early Universe.

Abstract Copyright:

Journal keyword(s): stars: Wolf-Rayet - stars: early-type - stars: mass-loss - stars: winds, outflows - stars: evolution

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 96548 WR* 11 06 17.2033098417 -65 30 35.237611013 7.10 7.80 7.70 8.49   WN8h 395 0
2 HD 192103 WR* 20 11 53.5274946554 +36 11 50.523501826 7.77 8.13 8.11     WC8+OB: 324 0

    Equat.    Gal    SGal    Ecl

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