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| Paper: |
High-Resolution Radio Observations of Massive Young Stellar Objects |
| Volume: |
267, Hot Star Workshop III: the Earliest Stages of Massive Star Birth |
| Page: |
137 |
| Authors: |
Hoare, M. G. |
| Abstract: |
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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