Identification of lambda Bootis stars using IUE spectra. II. High resolution data

Abstract

Stars included in the catalogue of lambda Bootis stars by Paunzen et al. (\cite{Paunzen97}) with high resolution spectra (FWHM: 0.10-0.25 Ä) in the INES Archive of the International Ultraviolet Explorer satellite (IUE) are analyzed here in order to establish membership criteria for the lambda Bootis group. Line-ratios of carbon to heavier elements (Si, Al, Ca) were adopted as criteria in the SWP range (1150-1980 Ä). For the LWP range (1850-3350 Ä), the intensity of metallic lines (Fe and Mg) was used. These criteria, together with those derived for low resolution spectra, make the IUE Final Archive a powerful tool to find new {lambda Bootis} candidates.