The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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Preliminary Result from Rapid Cadence Photometric Monitoring of HBC722

  • Baek, Gi-Seon (Department of Astronomy and Space Science, Kyung Hee University) ;
  • Green, Joel D. (Department of Astronomy, University of Texas at Austin) ;
  • Pak, Soo-Jong (School of Space Research, Kyung Hee University) ;
  • Lee, Jeong-Eun (School of Space Research, Kyung Hee University) ;
  • Eon, Yi-Seulj (CEOU/Department of Physics & Astronomy, Seoul National University) ;
  • Park, Won-Kee (CEOU/Department of Physics & Astronomy, Seoul National University) ;
  • Choi, Chang-Su (CEOU/Department of Physics & Astronomy, Seoul National University) ;
  • Kang, Won-Seok (School of Space Research, Kyung Hee University) ;
  • Im, Myung-Shin (CEOU/Department of Physics & Astronomy, Seoul National University)
  • Published : 2011.10.05
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Abstract

We observed a low-mass pre-main sequence star, HBC722 (also known as $LkH{\alpha}$ 188 G4), with Camera for QUasars in EArly uNiverse (CQUEAN) attached to 2.1 Otto Struve telescope at McDonald Observatory, USA. HBC722 is a new FU orionis-type object in the direction of NGC7000/IC5070, which produced large amplitude optical outbursts (${\delta}V$=4.7 mag over one year) for a few months and reached the peak in 2010 September. We carried out the photometric observation in SDSS r,i, and z band in 2011 April, July and August to monitor the long term decrease of its brightness. We also made continuous observation in r-band for half night in July, and whole two nights in August to investigate short term variability which could be related to the rotation of the central star or the inner circumstellar disk. In this poster, we present a preliminary result of the photometric observation for HBC722.

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