2005A&A...432..633G


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.13CET03:34:49

2005A&A...432..633G - Astronomy and Astrophysics, volume 432, 633-645 (2005/3-3)

Hydrodynamic model atmospheres for WR stars. Self-consistent modeling of a WC star wind.

GRAEFENER G. and HAMANN W.-R.

Abstract (from CDS):

We present the first non-LTE atmosphere models for WR stars that incorporate a self-consistent solution of the hydrodynamic equations. The models take iron-group line-blanketing and clumping into account, and compute the hydrodynamic structure of a radiatively driven wind consistently with the non-LTE radiation transport in the co-moving frame. We construct a self-consistent wind model that reproduces all observed properties of an early-type WC star (WC5). We find that the WR-type mass-loss is initiated at high optical depth by the so-called ``Hot Iron Bump'' opacities (FeIX-XVI). The acceleration of the outer wind regions is due to iron-group ions of lower excitation in combination with C and O. Consequently, the wind structure shows two acceleration regions, one close to the hydrostatic wind base in the optically thick part of the atmosphere, and another farther out in the wind. In addition to the radiative acceleration, the ``Iron Bump'' opacities are responsible for an intense heating of deep atmospheric layers. We find that the observed narrow OVI emission lines in the optical spectra of WC stars originate from this region. From their dependence on the clumping factor we gain important information about the location where the density inhomogeneities in WR-winds start to develop.

Abstract Copyright:

Journal keyword(s): stars: Wolf-Rayet - stars: early-type - stars: atmospheres - stars: mass-loss - stars: winds, outflows - stars: individual: WR 111

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 - 2020
#notes
1 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1083 1
2 HD 165763 WR* 18 08 28.4691215895 -21 15 11.182287576 7.16 7.54 7.82 8.55   WC6 263 0

    Equat.    Gal    SGal    Ecl

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2019.12.13-03:34:49

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