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Corrections for Hydrostatic Atmospheric Models: Radii and Effective Temperatures of Wolf Rayet Stars

Published online by Cambridge University Press:  14 August 2015

C. De Loore ,
P. Hellings  and
H.J.G.L.M. Lamers
C. De Loore
Affiliation:
1Astrophysical Institute, Pleinlaan 2 B-1050 Brussels
P. Hellings
Affiliation:
1Astrophysical Institute, Pleinlaan 2 B-1050 Brussels
H.J.G.L.M. Lamers
Affiliation:
2Space Research Laboratory, Beneluxlaan 21 NL-3527 Utrecht

Abstract

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With the assumption of planparallel hydrostatic atmospheres, used generally for the computation of evolutionary models, the radii of WR stars are seriously underestimated. The true atmospheres may be very extended, due to the effect of the stellar wind. Instead of these hydrostatic atmospheres we consider dynamical atmospheres adopting a velocity law. The equation of the optical depth is integrated outwards using the equation of continuity.

The “hydrostatic” radii are to be multiplied with a factor 2 to 8, and the effective temperatures with a factor 0.8 to 0.35 when Wolf Rayet characteristics for the wind are considered, and WR mass loss rates are used. With these corrections the effective temperatures of the theoretical models, which are helium burning Roche lobe overflow remnants, range between 30 000 K and 50 000 K. Effective temperatures calculated in the hydrostatic hypothesis can be as high as 150 000 K for helium burning RLOF-remnants with WR mass loss rates.

Type
SESSION 1 — THE WOLF-RAYET PHENOMENON
Information
Symposium - International Astronomical Union , Volume 99: Wolf-Rayet Stars: Observations, Physics, Evolution , 1982 , pp. 53 - 56
Copyright
Copyright © Reidel 1982 

References

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