Astron. Astrophys. Suppl. Ser. 131, 469-478
A.S. Miroshnichenko1,2 - Y.
Frémat3 - L.
Houziaux3 - Y. Andrillat4 - E.L.
Chentsov5 - V.G. Klochkova5
Send offprint request: A.S.Miroshnichenko
1 - Dept. of Physics & Astronomy, Univeristy of Toledo,
Toledo, OH 43606-3390, U.S.A.
e-mail: anatoly@physics.utoledo.edu
2 -
Central Astronomical Observatory of the Russian Academy of Sciences
at Pulkovo, Saint-Petersburg, 196140, Russia
3 -
Université de Mons-Hainaut, Groupe d'Astrophysique
et de Spectroscopie, 20 place du Parc, B-7000 Mons, Belgium
4 -
Laboratoire d'Astronomie, Université de
Montpellier 2, URA 1280 and 1981, CNRS, Place Eugène Bataillon,
34095 Monpellier Cedex 5, France
5 -
Special Astrophysical Observatory of the Russian Academy of
Sciences, Karachai-Cherkess Republic, Nizhnyi Arkhyz, 357147, Russia
Received February 5; accepted March 20, 1998
The results of high-resolution optical spectroscopy 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 first time with a resolution of 0.4 - 0.8 Å.
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 8864 Å many of which appear double-peaked. No significant
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 circumstellar envelope is viewed not edge-on. The systemic velocity
measured using the emission lines of ionized metals turned out to be
+55 km s-1, which corresponds to a distance towards the object of
3.0 0.2 kpc, 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
of nearly 25000 K, which, however, needs further improvement.
The other stellar parameters were found to be as follows: log
,
. Our study confirms
that MWC 314 is one of the most luminous stars in the Milky Way.
Key words: stars: early-type; supergiants; abundances -- stars: mass loss -- stars: individual: MWC 314
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