Multi-transition VLBA observations of circumstellar SiO masers

Details Multi-transition VLBA observations of circumstellar SiO masers Multi-transition VLBA observations of circumstellar SiO masers

2004-01-29

arxiv.org/abs/astro-ph/0401616v1

Astronomy and Astrophysics

Astrophysics

5 page, 6 figures. To be published in "Future Directions in High Resolution Astronomy", ASP Conference Series

Scientific paper

On this paper, we present simultaneous VLBA observations of the J=1-0 and J=2-1 rotational lines in the v=1 and v=2 vibrationally excited states of SiO (at 7 and 3 mm wavelengths). We have mapped these four maser lines in the circumstellar envelopes of three AGB stars: IRC +10011, Chi Cyg and TX Cam. We study the relative spatial distribution between these maser lines. In particular, for the two v=1 transitions, we found that the J=1-0 and J=2-1 maser spot distributions are unalike, challenging all the current theoretical pumping mechanisms for SiO masers (which predict quite similar distribution for maser lines in the same vibrational excited state).

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