Elemental abundances of the supergiant stars sigma sigma Cygnus and eta eta Leonis

This study aims to analyse the elemental abundances for the late B type supergiant star sigma sigma Cyg and the early A-type supergiant eta eta Leo using ATLAS9 (Kurucz, 1995 and Sbordone et al., 2004), assuming local thermodynamic equilibrium (LTE). The spectra used in this study are obtained from Dominion Astrophysical Observatory and have high resolution and signal-to-noise ratios. The effective temperature and the surface gravity of sigma sigma Cyg are determined from the ionisation equilibria of Al I/II, Mg I/II, Fe I/II, Fe II/III, and by fitting to the wings of H gamma H gamma and H beta H beta profiles as TeffTeff = 10388 K and log g = 1.80. The elemental abundances of eta eta Leo are determined using Teff = 9600 K and log g = 2.00, as reported by Przybilla et al. (2006).