Asymmetrical nebula of the M33 variable GR290 (WR/LBV)
  Context: GR290 (M33 V0532=Romano's star) is a luminous M33 object undergoing
photometric variability typical for luminous blue variable (LBV) stars. It lies
inside Wolf-Rayet region in the Hertzsprung-Russell diagram and possesses a WN8
type spectrum at the light minima. Analysis of Gran Telescopio Canarias (GTC)
spectra obtained in 2016 led to the conclusion that it is surrounded by an
unresolved HII region formed mostly of ejected material from the central star,
and disclosed the presence of a second, more extended asymmetrical emission
region. Aims: The aim of this paper is to further explore the structure of the
nearby environment of GR290. Methods: Long-slit spectra of GR290 were obtained
with three slit orientations in the visual and red spectral regions. The
emission-line distribution for each slit was analyzed. Results: We confirm the
presence of an asymmetric HII region that extends ~50 pc to the south; ~30pc to
the north and southeast; ~20 pc to the east and northwest and ~10pc to the
west. We also present the first spectrum to be acquired of a star belonging to
the neighboring OB88 association, J013501.87+304157.3, which we classify as a
B-type supergiant with a possible binary companion.
