AAS Meeting #193 - Austin, Texas, January 1999
Session 45. Spectral Observations of Stars
Display, Thursday, January 7, 1999, 9:20am-6:30pm, Exhibits Hall 1

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[45.15] 86 GHz SiO Maser Emission Towards Mira

R.B. Phillips (MIT Haystack Observatory), D.A. Boboltz (U.S. Naval Observatory), E.B. Ambrose (Vanderbilt University)

Mira (o Ceti) was observed with two independent 3mm VLBI arrays in April 1998. Unlike its counterpart R~Aqr, there are no published VLBI results on Mira, and little is known about how the SiO masers are arranged on circumstellar scales.

The international 3mm VLBI observations, coordinated through the CMVA, offered baseline lengths from 20 to 330~M\lambda. The major features of the \nu = 1, J = 2 arrow 1 SiO masers, whose velocity span is roughly \rm3.5~km~s-1, will be examined in the context of asymmetry and possible interaction by Mira with its companion VZ Ceti indicated on larger scales by optical and UV instruments such as the HST.

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