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The Structure and Kinematics of Envelope around Red Supergiant AH Sco Traced by SiO Masers

Published online by Cambridge University Press:  01 April 2008

X. Chen  and
Z.-Q. Shen
X. Chen
Affiliation:
Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, PR China email: chenxi@shao.ac.cn, zshen@shao.ac.cn
Z.-Q. Shen
Affiliation:
Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, PR China email: chenxi@shao.ac.cn, zshen@shao.ac.cn
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Abstract

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Observations of 43 GHz v = 1, J = 1−0 SiO masers in the circumstellar envelope of the M-type semi-regular variable star AH Sco were performed with the Very Long Baseline Array (VLBA) at 2 epochs in March 2004. These high-resolution VLBA images reveal that the distribution of SiO masers is roughly on a persistent elliptical ring with the lengths of the major and minor axes of about 18.5 and 15.8 mas, respectively, along a position angle of 150°. The 3-dimensional kinematics model-fitting for proper motions and spatial distributions of maser features clearly indicates that the SiO maser shell around AH Sco was undergoing an overall contraction to the star at a velocity of 15 km s−1 at a distance of 2.26 kpc to AH Sco due to the gravitation of the central star.

Keywords

(Stars:)circumstellar matter – masers – stars: individual (AH Sco)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 247 - 248
Copyright
Copyright © International Astronomical Union 2008

References

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