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- Title
Asymmetrical nebula of the M33 variable GR290 (WR/LBV).
- Authors
Maryeva, Olga V.; Koenigsberger, Gloria; Karpov, Sergey V.; Lozinskaya, Tatiana A.; Egorov, Oleg V.; Rossi, Corinne; Calabresi, Massimo; Viotti, Roberto F.
- Abstract
Context. GR290 (M 33 V0532 = Romano's star) is a luminous M33 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 II region 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 GR290. Methods. Long-slit spectra of GR290 were obtained with three slit orientations in the visual and red spectral regions. The emissionline distribution for each slit was analyzed. Results. We confirm the presence of an asymmetric H II region 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 OB88 association, J013501.87+304157.3, which we classify as a B-type supergiant with a possible binary companion.
- Subjects
EARLY stars; VARIABLE stars; NEBULAE; HR diagrams; SUPERGIANT stars; STELLAR winds; WOLF-Rayet stars
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2020, Vol 635, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201936840