NEW IDENTIFICATIONS FOR BLUE OBJECTS TOWARDS THE GALACTIC-CENTER - POST-AGE STARS, BE DISK STARS AND OTHERS/

As part of a programme to investigate spatial variations in the Galact ic chemical composition, we have been searching for normal B-type star s and A-type supergiants near the Galactic center. During this search we have found eleven peculiar stars, and in some cases performed detai led abundance analyses of them which suggest that they may be at a pos t-AGB evolutionary stage. The A-type post-AGB candidates show [Fe-H]=- 1.0 to -2,0, and [O/Fe]similar to+1.4, typical of the post-AGB abundan ce patterns discussed in the literature. One star, LS 3591 (=SAO 24375 6), has also been examined recently by Oudmaijer (1996); its spectrum appears to be changing very rapidly, which may indicate erratic mass l oss or the incipient formation of a planetary nebula. A B-type post-AG B candidate, LS 4950, has a similar spectrum to a well studied post-AG B star, LSIV -12 111. However, an examination of the line strengths an d elemental abundances of LS 4950 show that it is peculiar for both a Population II, post-AGB, E-type star and for a normal, Population I, E -type supergiant. Two other E-type stars, LS 4825 and LS 5112, are eit her post-AGB stars near the Galactic center or normal E-type supergian ts lying well beyond the Galactic center. In addition, several Be-type stars have been newly (or more clearly) identified from our spectra.