Protostellar formation in rotating interstellar clouds. VI - Nonuniform initial conditions

Details Protostellar formation in rotating interstellar clouds. VI - Nonuniform initial conditions Protostellar formation in rotating interstellar clouds. VI - Nonuniform initial conditions

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..149b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 149-161.

Astronomy and Astrophysics

Astrophysics

66

Binary Stars, Interstellar Matter, Molecular Clouds, Protostars, Rotating Matter, Star Formation, Angular Velocity, Astronomical Models, Density Distribution, Gravitational Collapse, Magnetohydrodynamic Flow

Scientific paper

The collapse and fragmentation of rotating protostellar clouds is explored, starting from nonuniform density and nonuniform rotation initial conditions. Whether binary fragmentation occurs during the first dynamic collapse phase depends strongly on the initial density profile. Exponential clouds are only somewhat more resistant to fragmentation than uniform-density clouds, but power-law clouds do not undergo fragmentation for likely values of a relevant parameter. Because binary fragments start from profiles intermediate between uniform density and exponential clouds, minimum protostellar mass for population I stars should be increased to approximately 0.02 solar mass. The axisymmetric Terey et al. (1984) model should be stable with respect to nonaxisymmetric perturbations. Considering the observed binary frequency, collapse from power-law initial conditions appears to be less common than collapse from more uniform initial conditions.

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