Actinium Abundance in the Atmospheres of Three Red Supergiants in the Magellanic Clouds

作者：Gopka V F^*; Shavrina A V; Yushchenko V A; Yushchenko A V; Pavlenko Ya V; Andrievsky S M; Vasileva S V; Kim Ch; Jeong Y; Lyubchik Yu P

来源：Kinematics and Physics of Celestial Bodies, 2018, 34(3): 123-133.

DOI：10.3103/S0884591318030054

• SMC
• LMC
• late-type stars
• PMMR23
• PMMR144
• RM_1-667
• nuclear reactions
• nucleosynthesis
• abundances of chemical elements
• actinium

The actinium abundance in the atmospheres of red supergiants PMMR23 and PMMR144 in the Small Magellanic Cloud and RM_1-667 in the Large Magellanic Cloud was estimated. The results of spectral observations with the ESO 3.6-m telescope with resolving power R = 30000 were used. Since actinium was not found in the atmospheres of PMMR23 and PMMR144, only the upper limits were set on its abundance: logN(Ac/H) <-15.1 and-15.0, respectively. The estimated abundance of actinium in the atmosphere of RM_1-667 varied with parameters of the atmospheric model from-14.1 to-13.3. The lines of ionized actinium lambda 616.475 nm and lambda 581.085 nm were used in this analysis.

• 出版日期2018-5