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The Color Variability Monitoring of HBC722
백기선,박수종,강원석,전이슬,최창수,이정은,임명신,Baek, Giseon,Pak, Soojong,Green, Joel D.,Kang, Wonseok,Jeon, Yiseul,Choi, Changsu,Lee, Jeong-Eun,Im, Myungshin 한국천문학회 2012 天文學會報 Vol.37 No.2
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.
Environment Effects on the Stability of the CQUEAN CCD
최나현,박수종,최창수,박원기,임명신,전이슬,백기선,Choi, Nahyun,Pak, Soojong,Choi, Changsu,Park, Won-Kee,Im, Myungshin,Jeon, Yiseul,Baek, Giseon 한국천문학회 2012 天文學會報 Vol.37 No.2
Camera for QUasars in EArly uNiverse (CQUEAN) is an optical CCD camera attached to the 2.1m Otto Struve telescope at the McDonald Observatory, USA. CCD output signal contains the electrons generated by photoionization of incident light and thermal ionization. Therefore reliable photometric result can be obtained only under the stable condition of CCD thermal properties. We investigated the temperature dependency of the various characteristics of CQUEAN CCD chip, including bias level, dark level, gain, and quantum efficiency (QE), with the CQUEAN observation and calibration data obtained during 2012 May run. We discuss the environmental effects, i.e., ambient temperature, as well as CCD temperature on the stability of its characteristics.
Type-Ia Supernova in M101: Latest Results
임명신,최창수,전이슬,전현성,박원기,김지훈,이지수,박수종,백기선,김상혁,오영석,전영범,성현일,윤태석,홍주은,김도형,김두호,장민성,현민희,박근홍,양희수,정일교,이방원,Im, Myungshin,Choi, Changsu,Jeon, Yiseul,Jun, Hyunsung,Park, Won-Kee,Kim, Ji Hoon,Lee, Jisoo,Pak, Soojong,Ba 한국천문학회 2012 天文學會報 Vol.37 No.2
SN 2011fe (also known as PTF 11kly) is a Type-1a supernova that appeared in M101, 2011 August. Being only 6.4 Mpc away, this supernova has been intensively observed by various facilities in the world. We monitored this supernova in UBVRI, grizY, and ZYJHK-bands using SNUO, LOAO, SOAO, CQUEAN/McDonald, UKIRT telescopes, and small telescopes in Korea and Mongolia. The monitoring observation is still ongoing, and the light curve has been accumulated over a year. We present the results of the long-term monitoring observation, together with a light-curve fitting result. We will also discuss our findings in terms of the usefulness of Type-Ia supernovae as a distance indicator.