High resolution spectroscopy of the galactic candidate LBV MWC 314

The results of high{resolution optical spec- troscopy obtained for a recently suggested LBV candidate, MWC 314, are presented. Photospheric lines mostly of N ii and S ii have been found for the rst time with a res- olution of 0:4 0:8 A. They imply a N/O overabundance previously reported for AG and HR Car since no O ii ab- sorptions were detected. Nearly 400 emission lines have been identied in the spectrum between 4190 and 8864 A many of which appear double{peaked. No signicant P Cyg{type absorption components have been found for the optically thick Balmer lines. This suggests that the stellar wind of MWC 314 is non{spherical and the circumstel- lar envelope is viewed not edge{on. The systemic veloc- ity measured using the emission lines of ionized metals turned out to be +55 km s 1 , which corresponds to a dis- tance towards the object of 3.0 0.2 kpc, according to the galactic rotation curve. Our analysis of the character- istics of both photospheric and wind lines resulted in an estimate of the object'sTe of nearly 25000 K, which, how- ever, needs further improvement. The other stellar param- eters were found to be as follows: log Lbol=L =6 : 1 0 :3, R =6 0 +30 10 R. Our study conrms that MWC 314 is one of the most luminous stars in the Milky Way.