Abundances of Iron-Peak Elements in HD 122563 from Ultraviolet Spectra

Abstract

view Abstract Citations (10) References (7) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Abundances of Iron-Peak Elements in HD 122563 from Ultraviolet Spectra Wolff, Sidney Carne ; Wallerstein, George Abstract Equivalent widths of 143 absorption lines in the region of 3400-3900 A have been used to improve the analysis of the atmosphere and composition of the metal-poor star HD 122563. Both neutral and ionized lines have been used to derive the relative abundances of the iron-peak elements and Sc, Y, and Zr. The even-odd elements, V, Mn, and Co, are deficient with respect to the even-even elements, Cr, Fe, and Ni, by a factor of 2.5 as compared to their ratios in the Sun. Sc, V, and Zr have about the same abundance relative to iron as they have in the Sun. The relative abundances of the iron-peak elements have been compared with calculations by Clifford and Tayler of equilibrium distributions of nuclei at high temperatures. If the iron-peak elements in this star were formed under such equilibrium conditions, the density of the material was in the range gm/cm3 the ratio of total protons to neutrons was in the range of 0.825-0.875; and the temperature was within the limits 2-3 X 100 K with some preference that it be closer to 3 x 100 than to 2 X 10 K. The wavelength dependence of the opacity has been derived using iron lines from 3400 to 6400 A. The opacity be understood in terms of both H- and Rayleigh scattering making an equal contribution at 3500 A. Publication: The Astrophysical Journal Pub Date: October 1967 DOI: 10.1086/149327 Bibcode: 1967ApJ...150..257W full text sources ADS | data products SIMBAD (2)