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Title:
Binary systems and stellar mergers in massive star formation
Authors:
Bonnell, Ian A.; Bate, Matthew R.
Affiliation:
AA(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AB(School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 362, Issue 3, pp. 915-920. (MNRAS Homepage)
Publication Date:
09/2005
Origin:
MNRAS
Astronomy Keywords:
binaries: general, stars: formation, stars: luminosity function, mass function, open clusters and associations: general
DOI:
10.1111/j.1365-2966.2005.09360.x
Bibliographic Code:
2005MNRAS.362..915B

Abstract

We present a model for the formation of high-mass close binary systems in the context of forming massive stars through gas accretion in the centres of stellar clusters. A low-mass wide binary evolves under mass accretion towards a high-mass close binary, attaining system masses of the order of 30-50 Msolar at separations of the order of 1 au. The resulting high frequency of binary systems with two massive components is in agreement with observations. These systems are typically highly eccentric and may evolve to have periastron separations less than their stellar radii. Mergers of these binary systems are therefore likely and can lead to the formation of the most massive stars, circumventing the problem of radiation pressure stopping the accretion. The stellar density required to induce binary mergers is ~106 stars pc-3, or ~0.01 that required for direct stellar collisions.

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