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Elemental abundances in atmospheres of cool dwarfs with solar-like activity

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Abstract

The elemental abundances in the atmosphere of the red dwarf HD 32147, which belongs to the HR 1614 moving groups, are analyzed. The atmospheric parameters determined from spectroscopic data (the condition of equal abundances for neutral and ionized atoms of a given element) differ considerably from those derived from photometry and parallax data. The abundances of several elements are also anomalous, with the anomaly increasing with decreasing ionization potential. It is concluded that this star is a red dwarf displaying solar-like activity; i.e., having dark (cool) spots on its surface, which may sometimes be considerable in size. Modeling synthetic spectra of stars with cool spots on their surfaces, with the spectral lines consisting of two components formed in media with different temperatures, indicate that the spectroscopic atmospheric parameters derived in such cases are incorrect; this can also explain the observed dependence of the elemental abundances on the corresponding ionization potentials. This leads to the conclusion thatHD32147 is indeed a star with solar-like activity. Several other such stars considered as examples display the same anomalies as those of HD 32147. These modeling results are also valid for Ap and Am stars, and are able to explain short-wavelength observations of the Sun and some stars (the FIP effect).

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  1. Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, Russia

    L. I. Antipova & A. A. Boyarchuk

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  1. L. I. Antipova
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Original Russian Text © L.I. Antipova, A.A. Boyarchuk, 2015, published in Astronomicheskii Zhurnal, 2015, Vol. 92, No. 12, pp. 956–976.

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Antipova, L.I., Boyarchuk, A.A. Elemental abundances in atmospheres of cool dwarfs with solar-like activity. Astron. Rep. 60, 145–162 (2016). https://doi.org/10.1134/S106377291512001X

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