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High resolution spectroscopy of the galactic candidate LBV MWC 314

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Anatoly S. Miroshnichenko, Associate Professor (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: 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 fi rst 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 identfi ed in the spectrum between 4190 and 8864 Å many of which appear double-peaked. No signi cant 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 Te of nearly 25000 K, which, however, needs further improvement. The other stellar parameters were found to be as follows: log Lbol=L = 6:1 ± 0:3,R = 60+30 -10 R . Our study con firms that MWC 314 is one of the most luminous stars in the Milky Way.

Additional Information

Publication
Astronomy and Astrophysics Supplement Series 131, 469-478 (1998)
Language: English
Date: 1998
Keywords
stars: early-type, supergiants, abundances - stars: mass loss - stars: individual: MWC 314