Observational support for radiative pumping of SiO masers in evolved stars

Details Observational support for radiative pumping of SiO masers in evolved stars Observational support for radiative pumping of SiO masers in evolved stars

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newar..43..559d&link_type=abstract

New Astronomy Reviews, Volume 43, Issue 8-10, p. 559-562.

Astronomy and Astrophysics

Astronomy

4

Scientific paper

SiO maser emission in AGB stars is found to be systematically distributed in ring structures, displaying tangential linear polarization. Using the VLBA, we have performed observations of such SiO maser emission at 43 GHz in the circumstellar envelopes of several late-type stars. We simultaneously mapped the /v=1 and /v=2, /J=1-0 transitions. Our new maps show, for most spots, a systematic spatial shift between both maser lines. We discuss the implication of these results on the possible pumping mechanisms, concluding that the existing data favour radiative pumping schemes.

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