Query : 2017A&A...607L...8V

2017A&A...607L...8V - Astronomy and Astrophysics, volume 607, L8-8 (2017/11-1)

Winds from stripped low-mass helium stars and Wolf-Rayet stars.


Abstract (from CDS):

We present mass-loss predictions from Monte Carlo radiative transfer models for helium (He) stars as a function of stellar mass, down to 2M. Our study includes both massive Wolf-Rayet (WR) stars and low-mass He stars that have lost their envelope through interaction with a companion. For these low-mass He stars we predict mass-loss rates that are an order of magnitude smaller than by extrapolation of empirical WR mass-loss rates. Our lower mass-loss rates make it harder for these elusive stripped stars to be discovered via line emission, and we should attempt to find these stars through alternative methods instead. Moreover, lower mass-loss rates make it less likely that low-mass He stars provide stripped-envelope supernovae (SNe) of type Ibc. We express our mass-loss predictions as a function of L and Z and not as a function of the He abundance, as we do not consider this physically astute given our earlier work. The exponent of the M versus Z dependence is found to be 0.61, which is less steep than relationships derived from recent empirical atmospheric modelling. Our shallower exponent will make it more challenging to produce "heavy" black holes of order 40M, as recently discovered in the gravitational wave event GW 150914, making low metallicity for these types of events even more necessary.

Abstract Copyright: © ESO, 2017

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

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 HD 45166 WR* 06 26 19.1551917864 +07 58 28.063354980 9.05 9.81 9.88     WRpec+B8V 80 1
2 GrW 150914 GWE ~ ~           ~ 553 1

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