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Spectroscopy of Supergiants with Infrared Excess: Results of 1998–2018

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Abstract

We shortly summarize here the results of the second stage (1998–2018) of the detailed spectroscopy program of peculiar supergiants identified with galactic infrared sources, performed at the 6-m BTA telescope. The main aspect of the program is a search for the evolutionary variations in the chemical composition of stars, past the AGB stage and the TDU, as well as an analysis of spectral manifestations of kinematic processes in their extended, often unstable, atmospheres and in the envelopes. The most significant result is detection of the s-process element excesses in seven single post-AGB stars, which empirically confirms the theory of evolution of this type of stars. In three of these stars we for the first time discovered the ejection of the s-process heavy metals to the circumstellar envelopes. A lithium excess was found in the atmospheres of peculiar supergiants V2324 Cyg and V4334 Sgr. The results of investigation of the kinematics of atmospheres and shells will clarify the equilibrium of matter produced by stars in the AGB and post-AGB stages and delivered to the interstellar medium (ISM).

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Acknowledgements

The author is grateful to the co-authors who participated in the implementation of the supergiant spectroscopy program at the BTA and in the preparation of joint publications. The work made use of the SIMBAD, SAO/NASA ADS, Gaia DR2, AAVSO and VALD astronomical databases.

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Correspondence to V. G. Klochkova.

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Russian Text © The Author(s), 2019, published in Astrofizicheskii Byulleten’, 2019, Vol. 74, No. 2, pp. 150–171.

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Klochkova, V.G. Spectroscopy of Supergiants with Infrared Excess: Results of 1998–2018. Astrophys. Bull. 74, 140–160 (2019). https://doi.org/10.1134/S1990341319020032

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