SiO bands in infrared spectra of late spectral stars

1Pavlenko, YV
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2019, 35(4):21-36
Start Page: Physics of Stars and Interstellar Medium
Language: Russian

The importance of account the SiO absorption in the infrared spectrum for analyzing the spectra of stars of late spectral classes. We used lists of the absorption lines of the rotation-virational bands, calculated by the group of J. Tennison in the framework of the ExoMol project. In the spectrum of red giant HD 196610 (V*EU Del, spectral class M6 III), taken from the IRTF spectra library we identified bands of isotopic molecules 28SiO, 29SiO, 30SiO. The relative abundance of silicon isotopes in the atmosphere of HD 196610 were obtained by modeling the bands of the first overtone SiO in the spectrum of a star. It turned out to be close (to within three percent) to the «solar» value. At the same time, the carbon isotope ratio 12C/13C = 6 ± 1, determined by fits to the observed isotopic bands of the first overtone of CO, testifies to the advanced stage of the evolution of HD 196610.

Keywords: physics of stars and interstellar media

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