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[94.11] VLBA H₂O Maser and VLA NH₃ Observations of the Early B Protostar G192.16--3.84

T. Borders (Sonoma State University), D.S. Shepherd, M. Claussen (NRAO), S.E. Kurtz (Instituto de Astronomia, UNAM)

We report the results of H₂O maser observations and NH₃ (1,1) line observations toward the massive protostar G192.16--3.84. H₂O maser detections provide evidence for the presence of a collimated jet 1'' North of G192.16. NH₃(1,1) observations show optically thin, extended emission around G192.16 with a mass of ~0.3 Msun. We discover a compact NH₃ core 30'' South of G192.16. No previous mm or cm continuum emission has been detected in this Southern core implying a possible pre-protostellar core and the next site of active star formation in this region. We find no evidence for the 1000 AU circumstellar molecular torus centered on G192.16 as suggested in previous studies.

This work was supported by the National Science Foundataion and the National Radio Astronomy Observatory.

The author(s) of this abstract have provided an email address for comments about the abstract: borders@universe.sonoma.edu

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.