Fe⁺ column density and line opacities of the UV2 multiplet of Fe bt II in laboratory and peculiar stellar sources in laboratory and peculiar stellar sources

Abstract

The Self-Absorption Curve method has been applied to the UV2 multiplet a⁶D-z⁶F^o of Fe ii observed in the laboratory and in emission-line stars. For the laboratory observations line opacities of this multiplet were obtained using various sets of atomic data. The best fit is obtained using data by Bergeson et al. (1996), which provide line opacities that are in remarkable agreement with results by Kastner (1999a), derived using independent methods. A value of 7.3x 10¹² cm^-2 for the Fe⁺ column density is derived for the laboratory source, and lower limits of 2.1x 10¹⁵ and ~ 2x 10¹⁷ cm^-2 are obtained for the peculiar stars KQ Pup and RR Tel, respectively. Based on observations made with the International Ultraviolet retrieved from the IUE archive.}