Mass-loss rate and clumping in LBV stars : the impact of time-dependent effects

  • This paper outlines a newly-developed method to include the effects of time variability in the radiative transfer code CMFGEN. It is shown that the flow timescale is often large compared to the variability timescale of LBVs. Thus, time-dependent effects significantly change the velocity law and density structure of the wind, affecting the derivation of the mass-loss rate, volume filling factor, wind terminal velocity, and luminosity. The results of this work are directly applicable to all active LBVs in the Galaxy and in the LMC, such as AG Car, HR Car, S Dor and R 127, and could result in a revision of stellar and wind parameters. The massloss rate evolution of AG Car during the last 20 years is presented, highlighting the need for time-dependent models to correctly interpret the evolution of LBVs.

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Metadaten
Author details:J. H. Groh, D. J. Hillier, A. Damineli
URN:urn:nbn:de:kobv:517-opus-17773
Publication type:Conference Proceeding
Language:English
Publication year:2007
Publishing institution:Universität Potsdam
Release date:2008/04/25
RVK - Regensburg classification:US 1999.07
Organizational units:Extern / Extern
DDC classification:5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften
Collection(s):Universität Potsdam / Tagungsbände/Proceedings (nicht fortlaufend) / Clumping in hot-star winds: International Workshop, Potsdam, Germany, 18. - 22. June 2007
Universität Potsdam / Tagungsbände/Proceedings (nicht fortlaufend) / Clumping in hot-star winds: International Workshop, Potsdam, Germany, 18. - 22. June 2007 / Talks and Discussions (in alphabetical order)
Universität Potsdam / Tagungsbände/Proceedings (nicht fortlaufend) / Clumping in hot-star winds: International Workshop, Potsdam, Germany, 18. - 22. June 2007 / Talks and Discussions (organized by sections) / Spectroscopy and mass loss diagnostic: observations
License (German):License LogoKeine öffentliche Lizenz: Unter Urheberrechtsschutz
External remark:
The complete edition of the proceedings "Clumping in hot-star winds" is available:
urn:nbn:de:kobv:517-opus-13981
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