High-Resolution Radio Observations of Massive Young Stellar Objects

Details High-Resolution Radio Observations of Massive Young Stellar Objects High-Resolution Radio Observations of Massive Young Stellar Objects

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..267..137h&link_type=abstract

Hot Star Workshop III: The Earliest Stages of Massive Star Birth. ASP Conference Proceedings, Vol. 267. Edited by Paul A. Crowth

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Scientific paper

The ionized stellar winds from massive young stellar objects (YSOs) are weak, compact, thermal radio sources. Resolution of these radio sources provides information on the geometry of the mass-loss and hence, constraints on the driving mechanism responsible. The few high-resolution radio observations made so far have revealed that some objects have radio jets similar to their low-mass counterparts. However, others have been discovered to have equatorial winds perpendicular to the larger scale bipolar molecular outflows. New multi-epoch observations of the equatorial wind in S140IRS 1 are presented. The proper motions detected confirm that this is not a radio jet. They also demonstrate strong structural variability on timescales of a month. These are discussed in terms of possible driving mechanisms.

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