MWC 930 - a new luminous blue variable candidate

Details MWC 930 - a new luminous blue variable candidate MWC 930 - a new luminous blue variable candidate

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.364..335m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 364, Issue 1, pp. 335-343.

Astronomy and Astrophysics

Astronomy

2

Techniques: Photometric, Techniques: Spectroscopic, Circumstellar Matter, Stars: Emission-Line, Be, Stars: Individual: Mwc 930

Scientific paper

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 FeII 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 (v∞~ 140kms-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= 3-4kpc. This strong and slow wind as well as the star's luminosity (logL/Lsolar~ 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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