your ID: 0187 First Name: Ye Last Name: Lu Affiliation: The national Astronomical Obsrvatoreis of China Title: The capture of a giant star or a main sequence star by massive black holes Authors: Y. Lu, Z. Zheng Topic: 1 Session: oral Abstract: Since the mass-radius relation is quite different for a giant(G) star and a main sequence (MS) star, we find that the radiation efficiencies for the capture of a G star or a MS star are very different. Given the mass of black holes, the results also show that the size of the accretion disk formed by the tidal debris, the involved viscose and the peak luminosity timescales for the capture of G stars are larger than that for the capture of MS stars. Paying special attention on the radiation efficiency of the capture process, the radiation of the capture of a G star is inefficiency, then relatively fainter, resulting in the total energy of jets are relatively lower. All these may provide a useful way to distinguish the capture of a G star from a MS star star capture process.