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We carried out photometric observations for HBC 722 in SDSS r, i and z bandsfrom 2011 April to 2013 May with a Camera for Quasars in Early uNiverseattached to the 2.1m Otto Struve telescope at McDonald Observatory. Thepost-outburst phenomena were classified into five phases according to not onlybrightness but also color variations, which might be caused by physical changesin the emitting regions of optical and near-infrared bands. A series ofspectral energy distribution (SED) is presented to support color variations andtrack the time evolution of SED in optical/near-infrared bands after theoutburst. Given two years of data, possible periodicities of r, i and z bandswere checked. We found out three families of signals around ~6, ~10 and ~1 daysin three bands, which is broadly consistent with Green et al. (2013). We alsoexamined short term variability (intra-day and day scales) to search forevidences of flickering by using the micro-variability method. We found clearsigns of day scale variability and weak indications of intra-day scalefluctuations, which implies that the flickering event occurs in HBC 722 afteroutburst.

Color Variability of HBC 722 in the Post-Outburst Phases