Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..442p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Oct. 1, 1991, p. 442-461.
Astronomy and Astrophysics
Astronomy
106
Dark Matter, Molecular Clouds, Protostars, Stellar Evolution, Carbon Monoxide, Molecular Flow, Star Formation
Scientific paper
Results are reported from a (C-12)O J = 2-1 survey of a sample of IRAS sources representative of low-mass young stellar objects embedded in dark molecular clouds. Several new outflows were identified and mapped. The survey reveals that less than about 70 percent of sources have associated outflow activity, suggesting that most, if not all, low-mass stars undergo outflow at some stage during their early evolution. The statistically implied outflow durations are an order of magnitude greater than flow dynamical time scales as would be derived in the normal way from CO maps. It is inferred from the data that outflows 'switch on' early in the protostellar phase and that the outflow duration is similar to the 'clearance time' at the end of which the source appears as an optically visible premain-sequence star. The possibility that outflows play a dominant role in driving the evolution of protostars is explored, and their integration into the evolutionary sequence proposed by Lada (1988) is discussed.
Padman Rachael
Parker Nicholas D.
Scott Paul F.
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