AAS 207th Meeting, 8-12 January 2006
Session 182 Stellar Winds, Circumstellar Matter, and Activity
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

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[182.11] SiO Maser Emission from the Evolved Stars RR Aql and AH Sco

H. Gerhardt (University of Maryland), D. Boboltz (USNO), M. Wittkowski (ESO)

We present the results of VLBA observations of the v=1, J=1-0 (43.1 GHz) and v=2, J=1-0 (42.8 GHz) SiO maser emission toward the Mira variable star RR Aql and the super giant star AH Sco. These observations were performed in conjunction with Very Large Telescope Interferometer (VLTI) observations of the circumstellar dust shells of these two stars. Concurrent observations using the two instruments allow us to study the relationship between the SiO maser region (2-4 stellar radii) and the nearby dust formation region (4-6 stellar radii). Two epochs of VLBA observations were recorded for each star with a temporal spacing of approximately 1 month. Here we present the first images of the SiO masers associated with AH Sco and RR Aql. We compare the images of the two transitions for each star and track changes in the masers as a function of time. The SiO masers will eventually be compared to stellar diameters and characteristics of the circumstellar dust zone as measured by VLTI. This data was analyzed at the U.S. Naval Observatory, Washington, DC, also in conjunction with the European Southern Observatory (ESO).

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