Abstract
The chemical composition of the PMMR23 red supergiant located in the Small Magellanic Cloud (SMC) is analyzed. The abundance of 35 chemical elements and the upper limits of abundance for Tl and U are found. The relative abundance of heavy elements is higher by 0.6–1.0 dex with respect to iron peak elements. The spectra of several SMC red supergiants PMMR27, PMMR28, and PMMR144—located in the region where the velocities of stars and interstellar gas are quite high— show the emission components in the wings of the hydrogen line. This emission is not detected for PMMR23. A possibility of interstellar gas accretion on the atmospheres of PMMR23 and other supergiants in Magellanic Clouds is discussed. The analysis is carried out using spectra measured at ESO 3.6 m telescope with the spectral resolving power R = 30000.
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Published in Ukrainian in Kinematika i Fizika Nebesnykh Tel, 2017, Vol. 33, No. 5, pp. 3–26.
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Yushchenko, A.V., Gopka, V.F., Shavrina, A.V. et al. Peculiarities of the abundance of chemical elements in the atmosphere of PMMR23-red supergiant in the Small Magellanic Cloud due to interstellar gas accretion. Kinemat. Phys. Celest. Bodies 33, 199–216 (2017). https://doi.org/10.3103/S0884591317050075
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DOI: https://doi.org/10.3103/S0884591317050075