Spectral Variability of the LBV star V532 in M33

Details Spectral Variability of the LBV star V532 in M33 Spectral Variability of the LBV star V532 in M33

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ysc..conf...21m&link_type=abstract

YSC'16 Proceedings of Contributed Papers (eds. Choliy V. Ya., Ivashchenko G.), pp. 21-24

Physics

Scientific paper

We present the results of spectral monitoring of the LBV star V532 (Romano star) in the M33 galaxy. Spectroscopic data cover 15 years of observations (from 1992 to 2007) during which V532 evolved from 16 mag to 18.5 mag. Spectral data were compared with photometrical data in B band. We show that the object in maximum of brightness behaves as an emission line supergiant while in minimum V532 moves along the sequence of late WN stars. We identify about 100 spectral lines in 3700-7300 Å wavelength range. For today, our spectroscopy is the most comprehensive for this object. The velocity of the wind was derived using HeI triplet lines (360 ± 30 km s^{-1}). This value is consistent with the wind velocities of late WN. Physical parameters of the nebula around V532 are estimated.

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