Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.1309b&link_type=abstract
American Astronomical Society Meeting 203, #13.09; Bulletin of the American Astronomical Society, Vol. 35, p.1227
Astronomy and Astrophysics
Astronomy
Scientific paper
MERLIN observations of water vapor maser emission, taken in May 2000,revealed an elliptical ring of masers (the``R4 ring'') located near the protostar Cepheus A HW2. The doppler kinematics were found to be consistent with rotation and outflow, and comparison with earlier VLBA observations showed evidence for expansion. We present new MERLIN observations of the R4 ring taken two years after the pilot observations. A model projection of the epoch 2000 maser spot distribution agrees well with the observed epoch 2002 spot distribution in spite of the complicating effects of maser variability and a possible overlapping maser arc not directly associated with the ring. The rotation of the maser ring is apparent both in the distribution of doppler velocities and spot proper motions. These new results support the interpretation that the R4 maser source is a 28 AU diameter, shocked ring of (perhaps protoplanetary) material in a disk rotating around a 3 solar mass protostar.
Beck Hans
Gallimore Jack
Thornley Michele
Wolfe Chip
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