보현산 천문대에서 관측한 새로운 원시성과 블랙홀 (This talk will be given in Korean)

We have been monitoring near-infrared light curves of a proto star (HBC 722) since its outburst with Korean Astronomy and Space Science Institute Infrared Camera System (KASINICS). The observational results of HBC 722 represent the very early evolution of the disk and circumstellar envelope on the FUors outburst. The outburst of a FUors is connected with an episode of increased mass accretion rate from the disk. The differential rotation of the disk is shown by the time delay of the fading period in our observations. The re-accretion rate and period after the maximum brightness were slightly changed by the differential rotation. The progenitor of HBC 722 is a Class II young stellar object (YSO) and deeply embedded in the circumstellar envelope. The infrared excess made by the circumstellar envelope disappeared right after the outburst. We also observed the very long lived bright Gamma-ray burst (GRB) at the near-infrared wavelengths in the Bohyunsan Optical Astronomy Observatory (BOAO). That was come out in the supermassive black hole, the last stage of stellar evolution, and the first detection of supermassive black hole which is theoretically expected object 40 years ago.