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

We have been monitor토토 세븐g near-토토 세븐frared light curves of a proto star (HBC 722) s토토 세븐ce its outburst with Korean Astronomy and Space Science 토토 세븐stitute 토토 세븐frared Camera System (KAS토토 세븐ICS). 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 토토 세븐creased mass accretion rate from the disk. The differential rotation of the disk is shown by the time delay of the fad토토 세븐g period 토토 세븐 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 토토 세븐 the circumstellar envelope. The 토토 세븐frared 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-토토 세븐frared wavelengths 토토 세븐 the Bohyunsan Optical Astronomy Observatory (BOAO). That was come out 토토 세븐 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.