Proper Motion of Water Masers in IRAS 21391+5802: Bipolar Outflow and a Dusty Circumstellar Shell

Details Proper Motion of Water Masers in IRAS 21391+5802: Bipolar Outflow and a Dusty Circumstellar Shell Proper Motion of Water Masers in IRAS 21391+5802: Bipolar Outflow and a Dusty Circumstellar Shell

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999alma.confe..48p&link_type=abstract

Science with the Atacama Large Millimeter Array (ALMA), Associated Universities, Inc., held October 6-8, 1999 at Carnegie Instit

Physics

Vlba, Water Maser, Emission, Star Formation, Bipolar Outflow, Keplerian Motion, Velocity, Outflow

Scientific paper

We present VLBA observations of water maser emission associated with the star forming region IRAS 21391+5802, which is embedded in a bright rimmed cometary globule in IC1396. The angular resolution of the maps is about 1 mas, corresponding to a spatial resolution of ~0.75 AU, at an assumed distance of 750 pc. Proper motions are derived for most of the maser features identified consistently over three epochs that were separated by intervals of about one month. The masers appear in four groups aligned linearly on the sky, roughly along a northeast--southwest direction, with a total separation of ~0."7 (520 AU). The mean magnitude of proper motions is ~35 km s-1 (7.5 AU yr-1). The average error on the derived proper motions is ~0.2 mas yr-1. The overall pattern of proper motions is indicative of a bipolar outflow. There is no evidence of Keplerian rotation, as has been claimed elsewhere. A nearly circular loop of masers lies near the center of the source. The radius of this loop is 0.8 AU and the line-of-sight velocities lie within 2 km s-1 of the systemic velocity of the region. The loop of masers presumably depicts the radius at which significant dust condensation occurs in the outflow away from the star.

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