Detection of ^29^SiO v=3 J=8->7 maser emission: a new IR SiO overlap.

Details Detection of ^29^SiO v=3 J=8->7 maser emission: a new IR SiO overlap. Detection of ^29^SiO v=3 J=8->7 maser emission: a new IR SiO overlap.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313l..13g&link_type=abstract

Astronomy and Astrophysics, v.313, p.L13-L16

Astronomy and Astrophysics

Astrophysics

11

Masers, Radiative Transfer, Stars: Agb, Circumstellar Matter, Stars: Late-Type

Scientific paper

We have performed detailed radiative transfer calculations which show that, in circumstellar envelopes of late-type stars, some submillimeter rotational transitions of ^29^SiO and ^30^SiO can be inverted with amplification high enough to be detected. The pumping mechanism is due to overlaps between ro-vibrational lines of the three stable SiO isotopomers. We present the detection of one of these lines, the v=3 J=8-7 transition of ^29^SiO, in four circumstellar sources. This is the highest frequency SiO maser detected up to date, and provides a strong confirmation of infrared SiO overlaps as efficient pumping agents of SiO masers.

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