Silicon monoxide in the 4 micron infrared spectrum of long-period variables

Details Silicon monoxide in the 4 micron infrared spectrum of long-period variables Silicon monoxide in the 4 micron infrared spectrum of long-period variables

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210l.141h&link_type=abstract

Astrophysical Journal, vol. 210, Dec. 15, 1976, pt. 2, p. L141-L144.

Astronomy and Astrophysics

Astrophysics

17

Infrared Spectra, M Stars, Silicon Oxides, Spectrum Analysis, Stellar Spectra, Variable Stars, Chromosphere, Electron Transitions, Free Radicals, Giant Stars, Molecular Spectra, Supergiant Stars

Scientific paper

The first-overtone sequence of vibration-rotation transitions of the free radical silicon monoxide are shown to have extreme phase-dependent variations in the spectra of two M-type long-period variables, Omicron Ceti and R Leonis, and the mild S-type long-period variable, Chi Cygni. At maximum light, the SiO band heads are not detectable. Near minimum light, the band heads of (Si-25)O are detected in the 4-micron spectra of all three stars. The band heads of the terrestrially less abundant isotopic species, (Si-29)O and (Si-30)O, are detected in Chi Cygni. Possible explanations of the phase-dependent behavior are discussed, and the role of the stellar chromosphere is considered.

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