High-excitation SiO maser emission in VY Canis Majoris - Detection of the V = 4 J = 5-4 transition

Details High-excitation SiO maser emission in VY Canis Majoris - Detection of the V = 4 J = 5-4 transition High-excitation SiO maser emission in VY Canis Majoris - Detection of the V = 4 J = 5-4 transition

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407l..33c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 407, no. 1, p. L33-L36.

Astronomy and Astrophysics

Astrophysics

36

Masers, Radio Spectra, Silicon Oxides, Stellar Envelopes, Stellar Spectra, Electron Transitions, Line Spectra, Maser Pumping, Molecular Excitation, Rotational Spectra, Stellar Models

Scientific paper

We report the detection of the v = 4 J = 5-4 transition of SiO in VY CMa, together with 13 maser lines of the same molecule corresponding to the rotational lines J = 1-0 to J = 6-5 of the vibrational levels 1-3. This is the first time that maser emission arising from a level of about 7000 K has been observed. The line profile from this transition has two different peaks at extreme velocities, in contrast to the strong v = 1 J = 2-1 maser, which has an intense emission peak at 22 km/s, i.e., closer to the velocity of the star. The density necessary to produce these high-excitation masers is about 10 exp 10 cu cm, and the SiO column densities have to be higher than or about 10 exp 20/sq cm. The maser chains inside a given vibrational level predicted by standard large velocity gradient models (radiative or collisional pumping) are not observed for v = 3 and v = 4, indicating that nonlocal effects and infrared line overlaps could play an important role in the pumping of these high-excitation masers.

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