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Molecular bands in the spectra of M stars

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Abstract

The profiles of the main molecular bands in the spectral-energy distributions (SEDs) of M stars have been calculated. The calculations of the individual band profiles were performed using the just-overlapping-lines approximation. Information about the oscillator strengths and the sources of the spectroscopic data for specific transitions between electronic levels of molecules is provided. The calculations of theoretical SEDs for M stars were performed using available lists of molecular lines for sources of bound-bound opacity in the atmospheres of oxygen-sequence stars. The observed SEDs of the oxygen-sequence red giant HD 148783 (30 Her) and the M dwarf 2MASS J22424129−2659272 are reproduced. The dependence of the calculated SEDs of the M giant on the adopted metallicity and carbon abundance is studied. The observed SEDs of HD 148783 and 2MASS J22424129−2659272 are described well by theoretical spectra calculated for model atmospheres with T eff/log g/[Fe/H] = 3250/ − 0.4/0 and 3000/5.0/0, respectively.

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  1. Main Astronomical Observatory, National Academy of Sciences of Ukraine, ul. Akademika Zabolotnoho 27, Kiev, 03680, Ukraine

    Ya. V. Pavlenko

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Correspondence to Ya. V. Pavlenko.

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Original Russian Text © Ya.V. Pavlenko, 2014, published in Astronomicheskii Zhurnal, 2014, Vol. 91, No. 11, pp. 933–942.

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Pavlenko, Y.V. Molecular bands in the spectra of M stars. Astron. Rep. 58, 825–834 (2014). https://doi.org/10.1134/S1063772914110043

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