Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.287..663h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 287, Issue 3, pp. 663-670.
Astronomy and Astrophysics
Astronomy
13
Masers, Stars: Agb And Post-Agb, Circumstellar Matter, Radio Lines: Stars
Scientific paper
Gray et al. reported the first detection of 300-GHz SiO maser emission from the v=1 and 2, J=7-6 transitions towards the symbiotic Mira system R Aquarii. We report the widespread detection of 300-GHz SiO maser emission towards long- period variable red giant and supergiant stars, showing that excitation of this line does not depend upon the presence of a close binary companion. The first detection of the SiO v=1, J=8-7 line and a 3sigma detection of the v=2, J=8-7 line towards the supergiant VY CMa are also reported. Successful simultaneous detections of the v=1 and 2, J=5-4, 6-5 and 7-6 lines towards three sources have been made. Detections of v=1 and 2, J=7-6 maser emission in VY CMa followed earlier unsuccessful observations of this object at 300GHz. In R Hya, J=7-6 emission was detected in the absence of corresponding emission in J=6-5 for both v=1 and 2 states. The presence of J=7-6 emission is almost certainly an indication of the presence of shock-heated material with a kinetic temperature above 3000K.
Field David
Gray Malcolm D.
Humphreys E. M. L.
Yates Jeremy A.
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