Self-consistent models of Wolf-Rayet stars as helium stars with optically thick winds

Mariko Kato, Icko Iben

研究成果: Article査読

31 被引用数 (Scopus)


We propose a helium star with a steady, optically thick wind as a first-order model for Wolf-Rayet stars. Using an enhanced opacity which is guided by results of recent opacity calculations, we obtain self-consistent solutions which are made up of an inner helium-burning core in hydrostatic equilibrium and an outer radiative envelope through which a steady state wind is accelerated. Our surface is at optical depth near unity. The models are of homogeneous composition (primarily helium) and are of mass in the range 9-30 M. In the most massive model, the momentum of the mass flow exceeds the photon momentum at the photosphere by a factor of 30. Terminal wind velocities are of order 1000 km s-1; these velocities are lower limits, as we neglect line-driven wind acceleration above the photosphere. For an appropriate choice of the opacity enhancement law, models of different mass define a relationship between the mass-loss rate [log M (M yr-1) from -5.5 to -3.5] and the photospheric temperature (7ph = 2-9 × 104 K) which is consistent with observed data. We also find a forbidden region in the low-temperature part of the H-R diagram where no thick wind solutions exist.

ジャーナルAstrophysical Journal
出版ステータスPublished - 1992

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


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