Continuum-driven winds from super-eddington stars: A tale of two limits

A. J. Van Marle, S. P. Owocki, N. J. Shaviv

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations

Abstract

Continuum driving is an effective method to drive a strong stellar wind. It is governed by two limits: the Eddington limit and the photon-tiring limit. A star must exceed the effective Eddington limit for continuum driving to overcome the stellar gravity. The photon-tiring limit places an upper limit on the mass loss rate that can be driven to infinity, given the energy available in the radiation field of the star. Since continuum driving does not require the presence of metals in the stellar atmosphere it is particularly suited to removing mass from low- and zero-metallicity stars and can play a crucial part in their evolution. Using a porosity length formalism we compute numerical simulations of super-Eddington, continuum driven winds to explore their behavior for stars both below and above the photon-tiring limit. We find that below the photon tiring limit, continuum driving can produce a large, steady mass loss rate at velocities on the order of the escape velocity. If the star exceeds the photon-tiring limit, a steady solution is no longer possible. While the effective mass loss rate is still very large, the wind velocity is much smaller.

Original languageAmerican English
Title of host publicationFirst Stars III
Pages250-253
Number of pages4
DOIs
StatePublished - 2008
EventFirst Stars III - Santa Fe, NM, United States
Duration: 15 Jul 200720 Jul 2007

Publication series

NameAIP Conference Proceedings
Volume990
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceFirst Stars III
Country/TerritoryUnited States
CitySanta Fe, NM
Period15/07/0720/07/07

Keywords

  • Radiative transfer
  • Stars: Population III
  • Stars: hot
  • Stars: winds
  • Ynamics

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