High-excitation (Si-29)O and (Si-30)O maser emission

Details High-excitation (Si-29)O and (Si-30)O maser emission High-excitation (Si-29)O and (Si-30)O maser emission

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401l.109c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 401, no. 2, p. L109-L112.

Astronomy and Astrophysics

Astrophysics

19

Emission Spectra, Interstellar Masers, Silicon Isotopes, Silicon Oxides, Supergiant Stars, Molecular Excitation, Molecular Rotation, Stellar Evolution, Vibrational Spectra

Scientific paper

We present the first detection of strong maser emission from high-J rotational levels of the v = 1, 2 vibrationally excited states of (Si-30)O and (Si-29)O in the oxygen-rich supergiant star VY CMa. In addition, both isotopes present strong maser emission in the J = 5-4 line of the ground vibrational state (v = 0). The obtained results, in particular the strong variations in intensity and profile of the different rotational lines within a given vibrational state, favor the interpretation of these masers as due to thermal and/or nonlocal overlap of the infrared lines of (Si-28)O with those of (Si-29)O and (Si-30)O, a mechanism that has been proposed by Cernicharo, Bujarrabal, and Lucas (1991) to pump the J = 4-3 v = 1 maser line of (Si-29)O.

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