Iron abundance in the atmosphere of Arcturus

Abstract

Abundance of iron in the atmosphere of Arcturus has been determined from the profiles or regions of the profiles of the weak lines sensitive to iron abundance. The selected lines of Fe I and Fe II were synthesized with the MARCS theoretical models of the atmosphere. From the observed profiles of lines available with a high spectral resolution in the atlas by Hinkle and Wallace (2005), the values of the iron abundance $A=6.95\pm 0.03$ and the radial-tangential macroturbulent velocity $5.6\pm 0.2$ km/s were obtained for Arcturus. The same physical quantities were found for the Sun as a star; they are $7.42\pm 0.02$ and $3.4\pm 0.3$ km/s, respectively. For Arcturus, the iron abundance relative to the solar one was determined with the differential method as [Fe/H] $=-0.48\pm 0.02$.

14 pages, 4 figures, 4 tables, published in Kinematika i Fizika Nebesnykh Tel, 2015, Vol. 31, no. 4, P. 21-38 (in Russian); Kinematics and Physics of Celestial Bodies, 2015, Vol. 31, no. 4, P. 172-183 (in English)

References in corpus (8)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The elemental composition of the Sun II. The iron group elements Sc to Ni
• Both accurate and precise gf-values for FeII lines
• Chemistry of the Sagittarius Dwarf Galaxy: a Top-Light IMF, Outflows and the R-Process
• 3-D non-LTE radiative transfer effects in Fe I lines: II. Line formation in 3-D radiation hydrodynamic simulations
• Micro- and macroturbulence predictions from CO5BOLD 3D stellar atmospheres
• Abundance sensitive points of line profiles in the stellar spectra
• Temperature stratification of the atmosphere of Arcturus

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