Detection of SiO J=7-6 maser emission

Details Detection of SiO J=7-6 maser emission Detection of SiO J=7-6 maser emission

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277l..67g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 3, pp. L67-L69.

Astronomy and Astrophysics

Astronomy

15

Masers, Binaries: Symbiotic, Stars: Individual: R Aqr, Radio Lines: Stars

Scientific paper

The first detections of the v=1 and v=2, J=7-6 SiO maser transitions at 300 GHz are reported. The detections were made towards the symbiotic Mira variable R Aquarii, using the James Clerk Maxwell Telescope. SiO maser transitions have previously been identified in late-type stars in transitions up to and including J=6-5, in the =1 and =2 states. There have been conflicting theoretical predictions concerning the J=7-6 transitions, and our earlier observations (which failed to detect either line towards R Leo or VY CMa) seemed to suggest that the most pessimistic prediction for the J=7-6 line intensity was correct. The detection reported here adds credence to the most recent (and optimistic) theoretical work, and suggests that the non-detections may have been attributable to strong variations in SiO maser output with stellar phase. Finally, we discuss a possible test of the hypothesis that J=7-6 SiO maser emission is seen towards R Aqr only because of its binary companion.

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