KSP-OT-201611a: A Distant Population II Dwarf Nova Candidate Discovered by the KMTNet Supernova Program. (arXiv:1906.07206v1 [astro-ph.SR])

KSP-OT-201611a: A Distant Population II Dwarf Nova Candidate Discovered by the KMTNet Supernova Program. (arXiv:1906.07206v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Lee_Y/0/1/0/all/0/1">Youngdae Lee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Moon_D/0/1/0/all/0/1">Dae-Sik Moon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kim_S/0/1/0/all/0/1">Sang Chul Kim</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Park_H/0/1/0/all/0/1">Hong Soo Park</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cha_S/0/1/0/all/0/1">Sang-Mok Cha</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lee_Y/0/1/0/all/0/1">Yongseok Lee</a>

We present a multi-color, high-cadence photometric study of a distant dwarf
nova KSP-OT-201611a discovered by the Korea Microlensing Telescope Network
Supernova Program. From October 2016 to May 2017, two outbursts, which
comprises a super/long outburst followed by a normal/short outburst separated
by $sim$91 days, were detected in the $BVI$ bands. The shapes and amplitudes
of the outbursts reveal the nature of KSP-OT-201611a to be an SU UMa- or U
Gem-type dwarf nova. Color variations of periodic humps in the super/long
outburst possibly indicate that KSP-OT-201611a is an SU UMa-type dwarf nova.
The super and normal outbursts show distinctively different color evolutions
during the outbursts due most likely to the difference of time when the cooling
wave is formed in the accretion disk. The outburst peak magnitudes and the
orbital period of the dwarf nova indicate that it is at a large Galactocentric
distance ($sim$13.8 kpc) and height ($sim$1.7 kpc) from the Galactic plane.
KSP-OT-201611a, therefore, may provide a rare opportunity to study the
accretion disk process of Population II dwarf novae.

http://arxiv.org/icons/sfx.gif