6 blue objects spectral data

During this search we have found eleven peculiar stars, and in some cases performed detailed abundance analyses of them which suggest that they may be at a post-AGB evolutionary stage. The A-type post-AGB candidates show [Fe/H]=-1.0 to -2.0, and [O/Fe]~+1.4, typical of the post-AGB abundance patterns discussed in the literature.

One star, LS 3591 (=SAO 243756), has also been examined recently by Oudmaijer (1996A&A...306..823O); its spectrum appears to be changing very rapidly, which may indicate erratic mass loss or the incipient formation of a planetary nebula. A B-type post-AGB candidate, LS 4950, has a similar spectrum to a well studied post-AGB star, LSIV -12 111. However, an examination of the line strengths and elemental abundances of LS 4950 show that it is peculiar for both a PopulationII, post-AGB, B-type star and for a normal, PopulationI, B-type supergiant.