Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..361p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, July 15, 1989, p. 361-370.
Astronomy and Astrophysics
Astronomy
104
Astronomical Models, Binary Stars, Star Formation, Stellar Evolution, Gravitational Collapse, Molecular Clouds, Pre-Main Sequence Stars, Protostars, Stellar Mass
Scientific paper
The conditions under which a dense molecular cloud core can collapse to form a binary, or multiple, star system are considered. It is proposed that fragmentation to form a binary is most simply achieved if collapse is initiated by an external impulse. On its own, this process would produce wide binaries, and it is suggested that close binaries are formed because of mutual interactions between the protostellar disks surrounding the various fragments. The nature and size of impulse required are discussed, and it is concluded that, given the internal structure of molecular clouds, such a requirement is not unreasonable. As a corollary, it is necessary in order for an external impulse to be able to initiate collapse that the dense cloud cores be thermally, and not magnetically, supported.
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