Thermal SiO emission in evolved stars

Details Thermal SiO emission in evolved stars Thermal SiO emission in evolved stars

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162..157b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 157-166.

Astronomy and Astrophysics

Astrophysics

59

Silicon Oxides, Stellar Spectra, Thermal Emission, Variable Stars, Astronomical Catalogs, Interstellar Masers, Mira Variables, Molecular Spectra, Radio Stars, Stellar Envelopes

Scientific paper

Radiotelescope data on the J = 2-1, v = 0 SiO transition, the J = 1-0 CO line and the J = 1-0 SiO maser line in 25 evolved (M-type Mira variables) stars are presented and discussed. The data were collected with the 30 m dish at Pico de Veleta and the 14 m instrument at Yebes (the maser lines). The line intensities were accurate to within 15 percent. The thermal SiO lines for the Mira variables in the sample are attributed to an extended inner envelope with a radius of about 1.5 x 10 to the 15th cm. The grains in the envelope have not coalesced and have a subsonic velocity. For the other stars, the thermal SiO emissions are produced by uniformly expanding inner envelopes, and no evidence was seen for the presence of outer circumstellar shells.

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