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

1
Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech Republic
2
Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetsky pr. 13, 119234 Moscow, Russia
3
INAF-Istituto di Astrofisica e Planetologia Spaziali di Roma (IAPS-INAF), Via del Fosso del Cavaliere 100, 00133 Roma, Italy
4
Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Ave. Universidad S/N, 62210 Cuernavaca, Mexico
5
Associazione Romana Astrofili, Via Carlo Emanuele I, n°12A, 00185 Roma, Italy
6
Physics Department, Università di Roma “La Sapienza”, Piazza le Aldo Moro 5, 00185 Roma, Italy
7
INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy
*
Author to whom correspondence should be addressed.
Based on observations made with the Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, in the island of La Palma, and with the Cassini 1.52-m telescope of the Bologna Observatory (Italy), as well as data retrieved from the public archive of the Special Astrophysical observatory of Russian Academy of Sciences (SAO RAS).
Galaxies 2019, 7(3), 79; https://doi.org/10.3390/galaxies7030079
Received: 31 July 2019 / Revised: 12 September 2019 / Accepted: 13 September 2019 / Published: 18 September 2019
(This article belongs to the Special Issue Luminous Stars in Nearby Galaxies)
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. View Full-Text
Keywords: galaxies: individual (M 33); stars: individual (GR 290, M 33 V0532); stars: variables: S Doradus; stars: Wolf-Rayet; stars: evolution; stars: winds, outflows galaxies: individual (M 33); stars: individual (GR 290, M 33 V0532); stars: variables: S Doradus; stars: Wolf-Rayet; stars: evolution; stars: winds, outflows
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Maryeva, O.; Viotti, R.F.; Koenigsberger, G.; Calabresi, M.; Rossi, C.; Gualandi, R. The History Goes On: Century Long Study of Romano’s Star. Galaxies 2019, 7, 79.

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