Observations of the first-overtone silicon monoxide bands in late-type stars

Details Observations of the first-overtone silicon monoxide bands in late-type stars Observations of the first-overtone silicon monoxide bands in late-type stars

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..201r&link_type=abstract

Astrophysical Journal, Part 1, vol. 262, Nov. 1, 1982, p. 201-212.

Astronomy and Astrophysics

Astrophysics

34

Late Stars, Molecular Spectra, Silicon Oxides, Stellar Spectra, Stellar Spectrophotometry, Absorption Spectra, Atmospheric Models, Cool Stars, Gratings (Spectra), Spectral Bands, Supergiant Stars

Scientific paper

Scans of the spectral region 3.98-4.07 micrometers, which includes the (2, 0) and (3, 1) rotation-vibration bands of silicon monoxide, have been made at a resolution of 5.5 per cm (88 A) in 74 late-type stars with a grating spectrometer and InSb detector. All the M giants and bright giants observed have detectable SiO absorption, and the bands strengthen rapidly with advancing type until at least M6. A similar trend is found in synthetic SiO strengths computed with model atmospheres. The SiO band strength varies considerably among M supergiants of the same spectral type and is strongly time-dependent in Mira variables. Since the observed spectra of even very late M stars and cool stars of type S exhibit the characteristic shape of SiO absorption, it appears that SiO is the dominant absorber in this region in all cool oxygen-rich stars. The highly luminous supergiants S Per and RW Cep may have the SiO bands in emission, while VY CMa, VX Sgr, and NML Cyg have featureless spectra at the resolution employed. Absorption from (Si-29)(O-16) was probably detected in the Mira variable R Cas near minimum light.

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