R Aquarii: First Detection of Circumstellar SiO Maser Proper Motions

Details R Aquarii: First Detection of Circumstellar SiO Maser Proper Motions R Aquarii: First Detection of Circumstellar SiO Maser Proper Motions

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...487l.147b&link_type=abstract

Astrophysical Journal Letters v.487, p.L147

Astronomy and Astrophysics

Astronomy

54

Stars: Binaries: Symbiotic, Stars: Circumstellar Matter, Masers, Stars: Individual Constellation Name: R Aquarii

Scientific paper

We have made the first detection of circumstellar SiO maser proper motions in the envelope of a late-type star. Using the Very Long Baseline Array (VLBA), we have obtained observations at four epochs of the 43 GHz, v = 1, J = 1--0 SiO maser emission toward the Mira variable in the symbiotic binary R Aqr. The maser emission has a ringlike structure approximately 31 mas across with a slight elongation in the north-south direction. We find that the emission changes significantly over a timescale of about 1--2 months with almost no similarity in structure for timescales >~6 months. Our observations show that over a 98 day period the masers have an average inward proper motion of about 1 mas. This contraction of the ring implies an infall velocity of about 4 km s-1 for the SiO masers in the circumstellar envelope.

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