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DDO68-V1: an extremely metal-poor LBV in a void galaxy

Published online by Cambridge University Press:  30 October 2019

Yulia Perepelitsyna  and
Simon Pustilnik
Yulia Perepelitsyna
Affiliation:
Special Astrophysical Observatory Russian Academy of Sciences, Nizhnij Arkhyz, Karachai-Circessia, 369167, Russia emails: jlyamina@yandex.ru, sap@sao.ru
Simon Pustilnik
Affiliation:
Special Astrophysical Observatory Russian Academy of Sciences, Nizhnij Arkhyz, Karachai-Circessia, 369167, Russia emails: jlyamina@yandex.ru, sap@sao.ru
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Abstract

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The lowest metallicity massive stars in the Local Universe with $Z\sim \left( {{Z}_{\odot }}/50-{{Z}_{\odot }}/30 \right)$ 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 $Z={{Z}_{\odot }}/35\,\left[ 12+\log \left( \text{O/H} \right)\sim 7.14 \right]$, 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 ($V\sim {{24.5}^{m}}-{{20}^{m}}$).

Keywords

stars: individual (DDO68-V1)stars: supergiantsstars: abundancesstars: mass lossstars: variables: LBVgalaxies: individual (DDO68, UGC5340)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 392 - 395
Copyright
© International Astronomical Union 2019 

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