SiO masers in variable stars

Details SiO masers in variable stars SiO masers in variable stars

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..552b&link_type=abstract

Astrophysical Journal, Part 1, vol. 215, July 15, 1977, p. 552-560.

Astronomy and Astrophysics

Astrophysics

23

Interstellar Masers, Red Giant Stars, Silicon Oxides, Stellar Radiation, Variable Stars, Abundance, Hydroxyl Emission, Infrared Spectra, M Stars, Stellar Spectra, Water Vapor

Scientific paper

Eight new long-period variable stars were found with maser emission from the first excited vibrational state of silicon monoxide. One of these, W Andromedae, is a spectral type S star, the second S star known to show SiO emission. A second, T Cephei, is a borderline case between M and S. Although H2O and OH maser emission is commonly found in the SiO stars, a search of 26 S-type stars for water has been negative, suggesting that the effect is real and arises from a chemical difference between the S stars and those of spectral type M. This may be a result of the high C/O ratio in spectral type S. A new source of ground-state SiO emission was found in NGC 2264. This is the first thermal SiO emission observed in a molecular cloud outside of Sgr B2 and Orion A.

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