Asymmetrical nebula of the M33 variable GR290 (WR/LBV)

Abstract

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.

arXiv comment11 pages, 10 figures, accepted for publication in A&A

References in corpus (15)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Physical Properties of Wolf-Rayet Stars
• STELIB: a library of stellar spectra at R~2000
• A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33
• The warm ionized medium in spiral galaxies
• The 2M++ galaxy redshift catalogue
• Molecular and Atomic Gas in the Local Group Galaxy M33
• Eta Carinae and the Luminous Blue Variables
• Crowded field 3D spectroscopy of LBV candidates in M33
• On the nature of high reddening of Cygnus OB2 #12 hypergiant
• Luminous blue variables: An imaging perspective on their binarity and near environment
• GR 290 (Romano's Star): 2. Light history and evolutionary state
• Wind and nebula of the M33 variable GR290 (WR/LBV)
• The History Goes On: Century Long Study of Romano's Star
• Ionized Gas Characteristics in the Cavities of the Gas and Dust Disc of the Spiral Galaxy NGC 6946

Cited by in corpus (5)

• Wind-envelope interaction as the origin of the slow cyclic brightness variations of luminous blue variables
• On the bipolarity of Wolf-Rayet nebulae
• Dense Molecular Environments of B[e] Supergiants and Yellow Hypergiants
• The History Goes On: Century Long Study of Romano's Star
• A machine-learning photometric classifier for massive stars in nearby galaxies II. The catalog