Open AccessBinary systems and stellar mergers in massive star formation
Author(s) -
Bonnell Ian A.,
Bate Matthew R.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.09360.x
Subject(s) - physics , astrophysics , accretion (finance) , stellar mass , stars , binary star , stellar mass loss , binary number , binary system , radiation pressure , astronomy , context (archaeology) , stellar evolution , x ray binary , blue straggler , star formation , star cluster , neutron star , paleontology , arithmetic , mathematics , biology
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 M ⊙ 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 ≈10 6 stars pc −3 , or ≈0.01 that required for direct stellar collisions.