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VLBI studies of SiO masers around VX Sagittarii

Published online by Cambridge University Press:  01 March 2007

X. Chen ,
Z.-Q. Shen  and
D.-R. Jiang
X. Chen
Affiliation:
Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, PR China email: [email protected], [email protected], [email protected] Department of Earth Sciences, National Taiwan Normal University, 88 Sec. 4, Ting-Chou Rd., Taipei 116, Taiwan
Z.-Q. Shen
Affiliation:
Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, PR China email: [email protected], [email protected], [email protected]
D.-R. Jiang
Affiliation:
Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, PR China email: [email protected], [email protected], [email protected]
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Abstract

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Observations of 43 GHz 28SiO (v = 1, J = 1-0) masers in the circumstellar envelope of the M-type semi-regular variable star VX Sgr were performed using the VLBA at 3 epochs during 1999 April-May. By tracing 42 matched maser features appearing in all the three epochs, we determined the contraction of an SiO maser shell toward VX Sgr at a velocity of about 4 km s−1 at a distance of 1.7 kpc to VX Sgr. We also report on some preliminary results from our first epoch of simultaneous VLBA observations of three 7 mm SiO masers toward VX Sgr.

Keywords

circumstellar mattermasersstars: individual (VX Sgr)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 312 - 313
Copyright
Copyright © International Astronomical Union 2008

References

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