The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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The Color Variability Monitoring of HBC722

  • Baek, Giseon (School of Space Research, Kyung Hee University) ;
  • Pak, Soojong (School of Space Research, Kyung Hee University) ;
  • Green, Joel D. (Department of Astronomy, University of Texas at Austin) ;
  • Kang, Wonseok (School of Space Research, Kyung Hee University) ;
  • Jeon, Yiseul (CEOU/Department of Physics & Astronomy, Seoul National University) ;
  • Choi, Changsu (CEOU/Department of Physics & Astronomy, Seoul National University) ;
  • Lee, Jeong-Eun (School of Space Research, Kyung Hee University) ;
  • Im, Myungshin (CEOU/Department of Physics & Astronomy, Seoul National University)
  • Published : 2012.10.17
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Abstract

We present the results of SDSS r, i and z band photometry for HBC722 (also known as $LkH{\alpha}$ 188 G4, PTF10qpf and V2493 Cyg), with Camera for Quasars in Early uNiverse (CQUEAN) attached to 2.1m Otto Struve telescope at McDonald Observatory, USA. HBC722 is a newly erupted FU Orionis type object, which produced optical outburst (${\Delta}V$=4.7 mag) over a year that peaked in 2010 September. We carried out the monitoring observations during 48 nights from 2011 April to 2012 June to check the short-term and the long-term variabilities for chasing the Keplerian rotation of the system. Comparing the photometric results of r, i and z band, we describe the color variability which is related to the physical properties of the system like circumstellar disk and accretion process.

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