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M. Claussen (NRAO), A. P. Sarma (E. Kentucky Univ.), A. Wootten (NRAO), K. B. Marvel (AAS), B. Wilking (UMSL)
We have used the NRAO's Very Long Baseline Array (VLBA) to image the water masers in the prototypical young stellar class 0 object IRAS~16293-2422 in the Rho Ophiuchi star formation region on less than 1 A.U. scales. This is an extension of earlier VLBA observations where we measured the proper motion of water masers in this source in a clearly detected bow shock feature. We also identified maser features in the direction of the embedded star itself. The new VLBA data presented here show the detection of circular polarization in a water maser feature whose radial velocity is near the radial velocity of masers that lie within a projected distance to the star of 1 AU. The Stokes V profile shows a Zeeman ``S''-shaped profile which is well-fit to the derivative of the Stokes I profile. For this feature we derive a line-of-sight magnetic field of approximately -40 milligauss.
The NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.