Other
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ycat..41310469m&link_type=abstract
VizieR On-line Data Catalog: J/A+AS/131/469. Originally published in: 1998A&AS..131..469M
Other
Stars: Emission, Equivalent Widths, Radial Velocities, Spectroscopy
Scientific paper
The results of high-resolution optical spectroscopy obtained for a recently suggested LBV (luminous blue variable) candidate, MWC 314, are presented. Photospheric lines mostly of N II and S II have been found for the first time with a resolution of 0.4-0.8Å. They imply a N/O overabundance previously reported for AG and HR Car since no O II absorptions were detected. Nearly 400 emission lines have been identified in the spectrum between 4190 and 8864Å many of which appear double-peaked. No significant P Cygni 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 circumstellar envelope is viewed not edge on. The systemic velocity measured using the emission lines of ionized metals turned out to be 55km/s, which corresponds to a distance towards the object of 3.0+/-0.2kpc, according to the galactic rotation curve. Our analysis of the characteristics of both photospheric and wind lines resulted in an estimate of the object's Teff of nearly 25000K, which, however, needs further improvement. The other stellar parameters were found to be as follows: Log(Lbol/L&sun;)=6.1+/-0.3, Rstar=60+30=10R&sun;. Our study confirms that MWC 314 is one of the most luminous stars in the Milky Way. (3 data files).
Andrillat Yvette
Chentsov Eugene L.
Frémat Yves
Houziaux Léo
Klochkova Valentina G.
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