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SiO Bands in the Infrared Spectra of Late-Type Stars

  • PHYSICS OF STARS AND INTERSTELLAR MEDIUM
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Abstract—The importance of taking the SiO absorption in the infrared spectrum into account for spectral analysis of late-type stars is demonstrated. The lists of absorption lines of the fundamental SiO system calculated by the group of J. Tennison in the ExoMol project were used. The bands of isotopic molecules 28SiO, 29SiO, and 30SiO were identified in the spectrum of red giant HD 196610 (V*EU Del, spectral class M6 III) taken from the IRTF spectra library. The relative abundance of silicon isotopes in the atmosphere of HD 196610 was estimated by modeling the bands of the first SiO overtone in the stellar spectrum. This abundance turned out to be close (within 3%) to the solar one. At the same time, the carbon isotope ratio 12C/13C = 6 ± 1 determined by modeling the isotopic components of the first overtone of CO bands suggests that HD 196610 is at an advanced stage of its evolution.

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ACKNOWLEDGMENTS

I thank my colleagues N. Evans (Astrophysics Group, Lennard Jones Laboratory, Keele University, United Kingdom), D. Banerjee (Physical Research Laboratory, Navrangpura, India), and U. Munari (INAF Astronomical Observatory of Padova, Italy), who contributed to the conception of this paper. Spectroscopic data calculated by the ExoMol group (funded by ERC as part of the Advanced Investigator 267219 project), the SIMBAD database (CDS, Strasbourg, France), and the Gaia spacecraft data (European Space Agency) were used. This study is based in part on archival data obtained using the infrared telescope operated by the University of Hawaii under a cooperative agreement with NASA. The author would like to thank the SAO/NASA ADS team for the development and support of this remarkable data system.

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This study was funded as part of the routine financing program for institutes of the National Academy of Sciences of Ukraine.

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Authors and Affiliations

  1. Main Astronomical Observatory, National Academy of Sciences of Ukraine, 03143, Kyiv, Ukraine

    Ya. V. Pavlenko

  2. Center for Astrophysics Research, University of Hertfordshire, Hertfordshire AL10 9AB, Hatfield, United Kingdom

    Ya. V. Pavlenko

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Correspondence to Ya. V. Pavlenko.

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Translated by D. Safin

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Pavlenko, Y.V. SiO Bands in the Infrared Spectra of Late-Type Stars. Kinemat. Phys. Celest. Bodies 35, 164–173 (2019). https://doi.org/10.3103/S0884591319040044

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