Мақола

MWC 930 -- a new luminous blue variable candidate

А. С. МирошниченкоCentral Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, 196140, Saint-Petersburg, RussiaK. S. BjorkmanRitter Observatory, Department of Physics and Astronomy, University of Toledo, Toledo, OH 43606-3390, USAM. GrossoComplejo Astronómico El Leoncito (CASLEO), Casilla de Correo 467, 5400 San Juan, ArgentinaH. Levato⋆Complejo Astronómico El Leoncito (CASLEO), Casilla de Correo 467, 5400 San Juan, ArgentinaK. N. GrankinUlugh Beg Astronomical Institute, Astronomicheskaya St. 33, Tashkent 700052, UzbekistanR. J. RudyThe Aerospace Corporation, M2/266, PO Box 92957, Los Angeles, CA 90009, USAD. K. LynchThe Aerospace Corporation, M2/266, PO Box 92957, Los Angeles, CA 90009, USAS. MazukThe Aerospace Corporation, M2/266, PO Box 92957, Los Angeles, CA 90009, USAR. C. PuetterCenter for Astrophysics and Space Science, University of California, San Diego, C-0111, La Jolla, CA 92093, USA

Monthly Notices of the Royal Astronomical Societyjournal2005en

ABI

Аннотация

We present the results of optical high-resolution and near-infrared low-resolution spectroscopy and multicolour optical and near-infrared photometry of the emission-line star MWC 930. The spectrum is rich with Fe ii emissions, most of which have P Cyg-type profiles. The emission lines are strong and narrow, indicating a powerful stellar wind with a low terminal velocity (υ∞~ 140 km s−1). The photospheric absorption lines are broad and show splitting, which might be due to the object's binarity. MWC 930 is most probably located in the Norma spiral arm at a distance of D= 3–4 kpc. This strong and slow wind as well as the star's luminosity (log L/L⊙~ 5.5) and the infrared excess shape suggest that MWC 930 is an unusual B-type supergiant, most likely undergoing the luminous blue variable evolutionary phase.

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Мавзулар

Stellar, planetary, and galactic studies Astrophysics and Star Formation Studies Astronomy and Astrophysical Research

Идентификаторлар

DOI: 10.1111/j.1365-2966.2005.09567.x

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