The analysis of actinium abundance in the atmospheres of three Magellanic Clouds red supergiants stars
| 1Gopka, VF, 2Shavrina, AV, 1Yushchenko, VA, 3Yushchenko, AV, 2Pavlenko, YV, 1Andrievsky, SM, 1Vasileva, SV, 4Kim, C, 5Jeong, Y, 2Lyubchik, YP 1Scientific Research Institute "Astronomical Observatory" of I.I.Mechnikov Odessa National University, Odesa, Ukraine 2Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine 3Astrocamp Contents Research Institute, Goyang, Republic of Korea 4Chungbuk National University, Cheongju, Republic of Korea 5Sejong University, Seoul, Republic of Korea |
| Kinemat. fiz. nebesnyh tel (Online) 2018, 34(3):25-41 |
| https://doi.org/10.15407/kfnt2018.03.025 |
| Start Page: Physics of Stars and Interstellar Medium |
| Language: Russian |
Abstract: The analysis of actinium abundance in the atmosphere of three red supergiants in Magellanic Clouds was performed. These are PMMR23 and PMMR144 in SMC and RM_1-667 in LMC. Spectral observations obtained at ESO 3.6 meter telescope with resolving power R = 30,000 were used. Only upper limits of actinium abundance were found for SMC stars PMMR23 and PMMR144: lgN(Ac/H) < –15.1 and –15.0. The abundance of actinium in the atmosphere of LMC red supergiant RM_1-667 was estimated to be in the range from lgN(Ac/H) = –14.1 to –13.3 if we accept different values for atmospheric parameters of this star. The lines of ionized actinium λ 616.475 nm and λ 591.085 nm was used for analysis. |
| Keywords: abundances, actinium, galaxies SMC, late-type stars, LMC, nuclear reactions, nucleosynthesis, PMMR144, PMMR23, RM_1-667 |
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