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The Formation of Very Massive Stars

  • Mark R. KrumholzEmail author
Chapter
Part of the Astrophysics and Space Science Library book series (ASSL, volume 412)

Abstract

In this chapter I review theoretical models for the formation of very massive stars. After a brief overview of some relevant observations, I spend the bulk of the chapter describing two possible routes to the formation of very massive stars: formation via gas accretion, and formation via collisions between smaller stars. For direct accretion, I discuss the problems of how interstellar gas may be prevented from fragmenting so that it is available for incorporation into a single very massive star, and I discuss the problems presented for massive star formation by feedback in the form of radiation pressure, photoionization, and stellar winds. For collision, I discuss several mechanisms by which stars might be induced to collide, and I discuss what sorts of environments are required to enable each of these mechanisms to function. I then compare the direct accretion and collision scenarios, and discuss possible observational signatures that could be used to distinguish between them. Finally, I come to the question of whether the process of star formation sets any upper limits on the masses of stars that can form.

Keywords

Star Formation Radiation Pressure Accretion Rate Massive Star Stellar Wind 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

I thank all the authors who provided figures for this review: H. Baumgardt, J. Dale, N. Moeckel, A. C. Myers, and D. Vanbeveren. During the writing of this review I was supported by NSF CAREER grant AST-0955300, NASA ATP grant NNX13AB84G, and NASA TCAN grant NNX14AB52G. I also thank the Aspen Center for Physics, which is supported by NSF Grant PHY-1066293, for hospitality during the writing of this review.

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© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Department of Astronomy & AstrophysicsUniversity of CaliforniaSanta CruzUSA

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