The peculiarities of chemical elements abundances in the atmosphere of PMMR23 – red supergiant of Small Magellanic Cloud, as a result of interstellar gas accretion
| 1Yushchenko, AV, 2Gopka, VF, 3Shavrina, AV, 2Yushchenko, VA, 2Vasileva, SV, 2Andrievsky, SM, 4Raikov, AA, Kim, S, 1Rittipruk, P, 1Yeuncheol, J, 1Kang, Y-W 1Astrocamp Contents Research Institute, Goyang, Republic of Korea 2Scientific Research Institute "Astronomical Observatory" of I.I.Mechnikov Odessa National University, Odesa, Ukraine 3Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine 4Pulkovo Astronomical Observatory, Pulkovo, Russia |
| Kinemat. fiz. nebesnyh tel (Online) 2017, 33(5):3-26 |
| https://doi.org/10.15407/kfnt2017.05.003 |
| Start Page: Physics of Stars and Interstellar Medium |
| Language: Ukrainian |
Abstract: PMMR23 is a red supergiant located in the region of Small Magellanic Cloud with low velocities of stars and interstellar gas. The abundances of 35 chemical elements and the upper limits for Tl and U were found in the atmosphere of the star. The relative abundances of heavy elements are enhanced with respect to iron group elements by 0.6—1.0 dex. The spectra of several SMC red supergiants PMMR27, PMMR48, PMMR102, PMMR144, located in the region high velocities of stars and interstellar gas, show the emission components in the wings of hydrogen line Hα. This emission is not detected for PMMR23. We discuss the possibility of accretion of interstellar gas on the atmospheres of PMMR23 and other supergiants in Magellanic Clouds. We made the analysis of chemical composition using spectra obtained at ESO 3.6 meter telescope with spectral resolving power R=30000. |
| Keywords: abundances of chemical elements, accretion, red supergiant PMMR23, Small Magellanic Cloud |
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