Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259..180h&link_type=abstract
Astrophysical Journal, Part 1, vol. 259, Aug. 1, 1982, p. 180-192.
Astronomy and Astrophysics
Astrophysics
99
Angular Momentum, Protostars, Stellar Evolution, Stellar Mass Ejection, Stellar Rotation, Water Masers, Flow Velocity, Magnetohydrodynamic Flow, Molecular Clouds, Stellar Magnetic Fields, Stellar Winds
Scientific paper
Recent radio observations have indicated that appreciable, continuing mass loss is occurring from regions of star formation. The conditions under which massive protostellar objects may exhibit strong, rotationally driven winds are investigated. For plausible rotational velocities and magnetic field strengths, ejection of about 10,000 solar masses a year at speeds of 10-100 km/s can be maintained for time scales of about 0.0001 yr; these values are insensitive to the protostellar luminosity. An evolutionary scenario is sketched which suggests that protostellar clouds may be expected to be rapidly rotating and to possess substantial magnetic fields when the clouds have contracted to radii of about 10 to the 14th cm. The centrifugally driven winds proposed present an alternative to fragmentation for providing the angular momentum loss required in the phase of rapid cloud contraction.
Hartmann Lee
MacGregor Keith B.
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