摘要：Context.GR 290 (M 33 V0532 = Romano’s star) is a luminous M 33 object undergoing photometric variability typical for luminous blue variable stars. It lies inside the Wolf-Rayet region in the Hertzsprung-Russell diagram and possesses a WN8-type spectrum at the light minima. Analysis of Gran Telescopio Canarias spectra obtained in 2016 led to the conclusion that it is surrounded by an unresolved H IIregion formed mostly of ejected material from the central star and revealed 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 GR 290.Methods.Long-slit spectra of GR 290 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 H IIregion that extends ~50 pc to the south; ~30 pc to the north, and southeast; ~20 pc to the east and northwest; and ~10 pc to the west. We also present the first spectrum to be acquired of a star belonging to the neighboring OB 88 association, J013501.87+304157.3, which we classify as a B-type supergiant with a possible binary companion.
关键词：Key wordsenstars: variables: S Doradusstars: Wolf-Rayetstars: evolutionstars: winds, outflowsgalaxies: individual: M33stars: individual: Romano’s star
