Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208...77h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 77-90.
Astronomy and Astrophysics
Astrophysics
31
Giant Stars, Interstellar Masers, Interstellar Matter, Silicon Oxides, Stellar Envelopes, Supergiant Stars, H Alpha Line, Late Stars, Light Curve, Mira Variables, Stellar Evolution, Stellar Spectra
Scientific paper
A multifrequency study of all parts of circumstellar envelopes of cool giants and supergiants is presented. In order to investigate the influence of stellar parameters on spectral features of these envelopes, a sample of 77 cool giants and supergiants that occupies a horizontal strip in the Hertzsprung-Russell diagram was observed. Spectroscopic and photometric observations at optical, infrared and radio wavelengths led to the following results: (1) for giants there exists a strong correlation between H-alpha emission and SiO masers, which led to the suggestion that SiO masers are triggered by shock-waves and can be pumped by collisions, (2) the SiO expansion velocity was found to be systematically lower by 2 km/s compared to the CO expansion velocity, and (3) a relation between the asymmetry of the light curve and the intensity of the dust emission at 9.7 microns has been confirmed for a wide range of periods. Rather than luminosity alone, pulsational properties of the variable play a dominant role for the structure of circumstellar envelopes of cool giants and supergiants.
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