Crowded field 3D spectroscopy of LBV candidates in M 33

Fabrika, S.; Sholukhova, O.; Becker, T.;Afanasiev, V.; Roth, M.; Sanchez, S. F.. Crowded field 3D spectroscopy of LBV candidates in M 33. Astronomy and Astrophysics. 2005, Vol. Volume 437, Issue 1, July I 2005, pp.217-226 , p. -2005.

or B[e]-supergiant. In v 532 an elongated nebula has been marginally detected. The total projected size of the nebula along the main axis is 30 pc, and the total radial velocity gradient is 44 ± 11 km s-1. v 532 exhibits both strong photometric and spectral variability. At the time of our observations it was in an intermediate brightness state with a rich nitrogen spectrum. We classify v 532 as an LBV, showing LBV ≤ftrightarrow Ofpe/WN transitions. We stress the importance of integral field spectroscopy as the optimal technique for studying nebulae and the evolution of LBV-like stars in nearby galaxies.