Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..431a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 431-439. Research supported by CAICYT.
Astronomy and Astrophysics
Astrophysics
34
Interstellar Masers, Silicon Oxides, Supergiant Stars, Variable Stars, Mira Variables, Molecular Spectra, Red Giant Stars, Stellar Envelopes
Scientific paper
A systematic study is presented of the SiO maser emission in nonregular (O-rich) variables: semiregular giants (SRGs) and supergiants (SGs), which was much less well known than for Miras (giant regular variables). It has been found that some SRGs and SGs attain the high level of maser emission characteristic of Miras, but others remain significantly weaker. This has been found to hold for v = 1, 2 J = 1-0 and v = 1 J = 2-1 masers. The well defined value of the SiO (peak flux)/IR(8-micron flux) ratio (about 1/5), attained by the Miras and by the strongest SRGs and SGs, is interpreted as representing the maximum efficiency of the radiative pumping. The low SiO/IR ratio of many SRGs and SGs is shown to be related to their low variation amplitude. This result is interpreted as being due to the fact that strong stellar pulses lead to the development of the inner envelope layers, where, from radiative pumping models and VLBI observations, the SiO maser emission arises.
Alcolea Javier
Bujarrabal Valentin
Gòmez-González Jesus
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