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86 GHz VLBI Imaging of the SiO Masers in VX Sgr

Published online by Cambridge University Press:  12 April 2016

S. S. Doeleman ,
C. J. Lonsdale  and
L. J. Greenhill
S. S. Doeleman
Affiliation:
Haystack Observatory, Westford, MA, U.S.A.
C. J. Lonsdale
Affiliation:
Haystack Observatory, Westford, MA, U.S.A.
L. J. Greenhill
Affiliation:
Harvard-CfA, Cambridge, MA, U.S.A.

Abstract

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We present the first 86 GHz spectral line VLBI map. Strong SiO masers in the late type star VX Sgr are mapped with a relative astrometry of 0.15 mas revealing an irregular ring of maser emission that echos structure seen at 43 GHz. A surprising feature of this map is the detection of a large (0.5 km s−1 AU−1 ) linear velocity gradient that can be interpreted as rigid rotation of the circumstellar envelope.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 363 - 364
Copyright
Copyright © Astronomical Society of the Pacific 1998

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