IUE observations of the eclipsing binaries TV CAS and YZ Cas.

Abstract

Two high resolution IUE spectra of the primaries of the eclipsing binaries TV Cas and YZ Cas are used to derive iron group abundances. YZ Cas shows clear metallicity effects (Fe is 6 times over abundant), while TV Cas does not. The metals in YZ Cas add up to a Z value of over 0.03. The microturbulent velocities are 6.5 km s^-1 (TV Cas) and 5.8 km s^-1 (YZ Cas). The spectrum of TV Cas does not show indication for the existence of mass flow. The calibrated low resolution spectrum of YZ Cas indicates that its T_eff is about 10,600K, E(B-V) is 0.07, and distance is 75 pc.