The History Goes On: Century Long Study of Romano's Star dagger

0518346 - ASÚ 2020 RIV CH eng J - Journal Article
Maryeva, Olga - Viotti, R.F. - Koenigsberger, G. - Calabresi, M. - Rossi, C. - Gualandi, R.
The History Goes On: Century Long Study of Romano's Star dagger.
Galaxies. Roč. 7, č. 3 (2019), č. článku 79. E-ISSN 2075-4434
R&D Projects: GA ČR(CZ) Ga18-05665S
EU Projects: European Commission(XE) 823734
Institutional support: RVO:67985815
Keywords : stars * evolution * winds
OECD category: Astronomy (including astrophysics,space science)
Method of publishing: Open access

GR 290 (M 33 V0532 = Romano's Star) is a unique variable star in the M33 galaxy, which simultaneously displays variability typical for luminous blue variable (LBV) stars and physical parameters typical for nitrogen-rich Wolf-Rayet (WR) stars (WN). As of now, GR 290 is the first object which is confidently classified as a post-LBV star. In this paper, we outline the main results achieved from extensive photometric and spectroscopic observations of the star: the structure and chemical composition of its wind and its evolution over time, the systematic increase of the bolometric luminosity during the light maxima, the circumstellar environment. These results show that the current state of Romano's Star constitutes a fundamental link in the evolutionary path of very massive stars.
Permanent Link: http://hdl.handle.net/11104/0303505