HIGH-RESOLUTION OPTICAL SPECTROSCOPY OF THE HOT R-CRB STAR V348-SAGITTARII

High resolution optical spectra of the unique hot R CrB star V348 Sgr are presented and more than 500 spectral lines of 14 elements are iden tified. The spectrum is very complex and four types of line profiles c an be distinguished: a) pure absorption lines, b) P-Cygni lines, c) pu re emission lines and d) P-Cygni (He I) or emission (C II) profiles wi th central absorption reversal. The spectrum is interpreted as that of an expanding atmosphere of small optical thickness with wind velociti es between 150 and 200 km s-1. Hydrogen is definitely present in the e xpanding atmosphere. The absorption line spectrum is very similar to t hat of the extreme helium stars DY Cen and LSE 78.