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Neutral stellar winds that drive bipolar outflows in low-mass protostarsThe Arecibo radio telescope at the 21-cm line of atomic hydrogen has been used to detect a neutral atomic wind in the bipolar flow source HH 7-11. An atomic mass of about 0.015 solar associated with the rapidly flowing gas is deduced. The stellar mass-loss rate is roughly 3 x 10 to the -6th solar mass/yr if the crossing time of the decelerating wind is 5000 yr. The excess emission in the H I line core gives a total duration of the outflow of about 70,000 yr. A detailed analysis of the H I line shape yields a reasonable deceleration rate for the atomic wind if the stellar wind continuously entrains ambient molecular gas as it propagates from the protostar. A stellar wind with the described characteristics and a terminal velocity of 170 km/s would be more than sufficient to drive the known extended CO bipolar outflow in HH 7-11.
Document ID
19880049582
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lizano, Susana
(California Univ. Berkeley, CA, United States)
Heiles, Carl
(California Univ. Berkeley, CA, United States)
Koo, Bon-Ghul
(California Univ. Berkeley, CA, United States)
Shu, Frank H.
(California, University Berkeley, United States)
Rodriguez, Luis F.
(Universidad Nacional Autonoma de Mexico Mexico City, United States)
Date Acquired
August 13, 2013
Publication Date
May 15, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 328
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A36809
Distribution Limits
Public
Copyright
Other

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