2002A&A...392..553V


Query : 2002A&A...392..553V

2002A&A...392..553V - Astronomy and Astrophysics, volume 392, 553-562 (2002/9-3)

Hot horizontal branch stars: Predictions for mass loss. Winds, rotation, and the low gravity problem.

VINK J.S. and CASSISI S.

Abstract (from CDS):

We predict mass-loss rates for the late evolutionary phases of low-mass stars, with special emphasis on the consequences for the morphology of the Horizontal Branch (HB). We show that the computed rates, as predicted by the most plausible mechanism of radiation pressure on spectral lines, are too low to produce EHB/sdB stars. This invalidates the scenario recently outlined by Yong et al. (2000) to create these objects by mass loss on the HB. We argue, however, that mass loss plays a role in the distribution of rotational velocities of hot HB stars, and may - together with the enhancement of heavy element abundances due to radiative levitation - provide an explanation for the so-called ``low gravity'' problem. The mass loss recipe derived for hot HB (and extreme HB, sdB, sdOB) stars may also be applied to post-HB (AGB-manque, UV-bright) stars over a range in effective temperatures between 12500-40000K.

Abstract Copyright:

Journal keyword(s): stars: horizontal-branch - subdwarfs - stars: mass-loss - stars: winds, outflows - stars: evolution - galaxy: globular clusters: general

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 865 1
2 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 830 0
3 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 961 0

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2022.08.09-04:12:51

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