The Relative Spatial Distribution of SiO Masers in AGB Stars at 43 and 86 GHz

Details The Relative Spatial Distribution of SiO Masers in AGB Stars at 43 and 86 GHz The Relative Spatial Distribution of SiO Masers in AGB Stars at 43 and 86 GHz

2002-06-19

arxiv.org/abs/astro-ph/0206326v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the 6th European VLBI Network Symposium, Ros, E., Porcas, R.W., Lobanov, A.P., & Zensus, J.A. (eds.), MPIfR, Bo

Scientific paper

We present the first VLBI images of SiO masers in the circumstellar envelope of an S-type star obtained with the newly developed capabilities of the Very Long Baseline Array (VLBA) at 86 GHz. We combine these data with those obtained quasy simultaneously at 43 GHz. These observations provide information on the structure and dynamics of the innermost circumstellar shells, where the return of large quantities of stellar material to the interstellar medium starts. Despite of the fact that these are prelimininary results, we report that the maser emission of the $v$=1 J=1--0 and J=2--1 present a very different emission distribution, being not coincident in most case.

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