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| Paper: |
Multi-Transition VLBA Observations of Circumstellar SiO Masers |
| Volume: |
340, Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA |
| Page: |
384 |
| Authors: |
Soria-Ruiz, R.; Colomer, F.; Alcolea, J.; Desmurs, J.-F.; Bujarrabal, V.; Marvel, K.M.; Diamond, P.J.; Boboltz, D. |
| Abstract: |
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 λ ∼ 7 and 3 mm). We have mapped these four maser lines in the circumstellar envelopes of three AGB stars: IRC+10011, χ Cyg and TXCam. 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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