Eruptive mass loss in very massive stars and Population III stars

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

I discuss the role played by short-duration eruptive mass loss in the evolution of very massive stars. Giant eruptions of Luminous Blue Variables (LBVs) like the 19th century event of η Carinae can remove large quantities of mass almost instantaneously, making them significant in stellar evolution. They can potentially remove much more mass from the star than line-driven winds, especially if stellar winds are highly clumped such that previous estimates of O-star massloss rates need to be revised downward. When seen in other galaxies as "supernova impostors," these LBV eruptions typically last for less than a decade, and they can remove of order 10 M as indicated by massive nebulae around LBVs. Such extreme mass-loss rates cannot be driven by radiation pressure on spectral lines, because the lines will completely saturate during the events. Instead, these outbursts must either be continuum-driven super-Eddington winds or outright hydrodynamic explosions, both of which are insensitive to metallicity. As such, this eruptive mode of mass loss could also play a pivotal role in the evolution and ultimate fate of massive metal-poor stars in the early universe. If they occur in these Population III stars, such eruptions would also profoundly affect the chemical yield and types of remnants from early supernovae and hypernovae thought to be the origin of long gamma-ray bursts.

Original languageEnglish (US)
Title of host publicationMassive Stars
PublisherCambridge University Press
Pages187-198
Number of pages12
ISBN (Electronic)9780511770593
ISBN (Print)9780521762632
DOIs
StatePublished - Jan 1 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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