DDO68-V1: an extremely metal-poor LBV in a void galaxy
arXiv:1812.03686 · doi:10.1017/S1743921318006439
Abstract
The lowest metallicity massive stars in the Local Universe with Z~(Zo/50-Zo/30) are the crucial objects to test the validity of assumptions in the modern models of very low-metallicity massive star evolution. These models, in turn, have major implications for our understanding of galaxy and massive star formation in the early epochs. DDO68-V1 in a void galaxy DDO68 is a unique extremely metal-poor massive star. Discovered by us in 2008 in the HII region Knot3 with Z = Zo/35 [12+log(O/H)=7.14], DDO68-V1 was identified as an LBV star. We present here the LBV lightcurve in V band, combining own new data and the last archive and/or literature data on the light of Knot3 over the 30 years. We find that during the years 2008-2011 the LBV have experienced a very rare event of `giant eruption' with V-band amplitude of 4.5 mag (V~24.5-20 mag).
arXiv comment4 pages, 4 figures, Proceedings IAU Symposium No. 344; "Dwarf Galaxies: From the Deep Universe to the Present"; K. McQuinn, S. Stierwalt, eds
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