Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..475a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 2, Jan. 1992, p. 475-486. Research supported by CICYT.
Astronomy and Astrophysics
Astrophysics
23
Interstellar Masers, Molecular Spectra, Stellar Envelopes, Stellar Radiation, Emission Spectra, Light Curve
Scientific paper
Results are presented from a systematic study of the v = 0 emission of (Si-29)O and (Si-30)O in 38 evolved stars previously known as intense (v greater than 0) (Si-28)O maser sources, including 30 Mira-type variables, two giant semiregular variables, and six supergiants. The v = 0 J = 1-0 (Si-29)O transition was observed in all 38 objects, including eight new sources; the transition of (Si-30)O was observed in 13 stars, including one new detection. The observational characteristics of both the (Si-29)O and (Si-30)O lines confirm that they are produced by maser amplification. The very simple and narrow profiles of the (Si-29)O and (Si-30)O v = 0 masers found in the observed objects contrasted with the large width of the thermal lines and with profiles of OH masers (contrary to the assumption of previously published models that (Si-29)O and (Si-30)O profiles are similar to those observed in OH emission).
Alcolea Javier
Bujarrabal Valentin
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