Proper Motion of Water Masers Associated with IRAS 21391+5802

Details Proper Motion of Water Masers Associated with IRAS 21391+5802 Proper Motion of Water Masers Associated with IRAS 21391+5802

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..300p&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Physics

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 confidently over all three epochs, which 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 bipolar outflow. Proper motions of the masers in the central group within a projected radius of ~ 10 AU, show systematic deviations from the outflowing motion. There is however, no evidence of Keplerian rotation, as has been claimed elsewhere. A nearly circular loop of masers is found 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 represents the inner edge of a dust-laden shell of outflowing material surrounding the young stellar object (YSO).

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