The Structure and Kinematics of Envelope around Red Supergiant AH Sco Traced by SiO Masers
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.
(Stars:)circumstellar matter-masers-stars:individual (AH Sco)
X.Chen Z.-Q.Shen
Shanghai Astronomical Observatory,80 Nandan Road,Shanghai 200030,PR China
国际会议
The 252th Symposium of the International Astronomical Union(国际天文学联合会第252届研讨会)
海南三亚
英文
247-248
2008-04-06（万方平台首次上网日期，不代表论文的发表时间）