The History Goes On: Century Long Study of Romano’s Star. (arXiv:1909.08765v1 [astro-ph.SR])

The History Goes On: Century Long Study of Romano’s Star. (arXiv:1909.08765v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Maryeva_O/0/1/0/all/0/1">Olga Maryeva</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Viotti_R/0/1/0/all/0/1">Roberto F. Viotti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Koenigsberger_G/0/1/0/all/0/1">Gloria Koenigsberger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Calabresi_M/0/1/0/all/0/1">Massimo Calabresi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rossi_C/0/1/0/all/0/1">Corinne Rossi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gualandi_R/0/1/0/all/0/1">Roberto Gualandi</a>

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.

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