VLBA Observations of the SiO Masers in the Eruptive Variable V838 Monocerotis

Details VLBA Observations of the SiO Masers in the Eruptive Variable V838 Monocerotis VLBA Observations of the SiO Masers in the Eruptive Variable V838 Monocerotis

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910110c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #101.10; Bulletin of the American Astronomical Society,

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We report on high angular resolution observations (beamsize 300 microarcsec) of the SiO masers in the enigmatic eruptive variable V838 Monocerotis. The SiO masers were first discovered by Deguchi et al. (2005) in February 2005, some 3 years after the optical outburst in January 2002. The spectral profiles of the SiO masers are similar to those seen in AGB/Mira circumstellar envelopes, where the masers are found within a few stellar radii above the photosphere. Six epochs of observations separated roughly at 2 3 month intervals have been made using the NRAO Very Long Baseline Array (VLBA), ranging from October 2005 to September 2006. We will present the images from these observations for both v=1 and v=2 J = 1->0 transitions of the masers (at 7 mm); the analysis of these images will provide kinematic information on the circumstellar gas, and the astrometry of the maser spots will allow an estimate of a lower limit to the distance of the source. We will discuss these results in the context of other estimates of the distance and the infrared dust emission and possible pumping mechanisms for the masers.
The NRAO is operated by Associated Universities, Inc. under cooperative agreement with the National Science Foundation. SS acknowledges partial support to ASU from the NSF and NASA.

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