Iron abundance in the atmosphere of Arcturus

1Sheminova, VA
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2015, 31(4):21-38
Start Page: Physics of Stars and Interstellar Medium
Language: Russian

Determination of iron abundance in the atmosphere of Arcturus is performed using the profiles or profile portions of the weak lines sensitive to iron abundance. On the basis of the spectral atlas of Hinkle and Wallance (2005) with high spectral resolution and the synthesis of selected Fe I and Fe II lines within the MARCS model atmospheres, we got the iron abundance A = 6.95 ± 0.03 and the radial-tangential macroturbulent velocity 5.6 ± 0.2 km/sec for Arcturus and A = 7.42 ± 0.02 and 3.4 ± 0.3 km/s for the Sun as a star. For Arcturus we obtained the iron abundance relative to the solar abundance [Fe/H] = –0.48 ± 0.02.

Keywords: Arcturus, atmosphere

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