MWC 930 -- a new luminous blue variable candidate

Autor: R. J. Rudy, Mónica Grosso, S. M. Mazuk, David K. Lynch, Karen S. Bjorkman, K. N. Grankin, Hugo Levato, Anatoly S. Miroshnichenko, R. C. Puetter
Rok vydání: 2005
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society. 364:335-343
ISSN: 1365-2966
0035-8711
DOI: 10.1111/j.1365-2966.2005.09567.x
Popis: 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 Fen emissions, most of which have P Cyg-type profiles. The emission lines are strong and narrow, indicating a powerful stellar wind (M ≥ 1.5 x 10 -6 M ○. yr -1 ) with a low terminal velocity (u∞ ∼ 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.
Databáze: OpenAIRE
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