Heating of a Star by Disk Accretion

摘要: We examine various ways in which disk accretion can heat an accreting star. These include (1) radiation emitted from the surface that is intercepted by stellar surface, (2) radiative flux directly across disk-star interface, and (3) advection of thermal energy into For each these, physics boundary layer between star crucial for determining amount heating occurs. assess importance methods listed above pre-main-sequence stars cataclysmic variables, using recent models layers these systems. find tends to be most important source thin systems such as T Tauri high- variables. argue direct interface will unimportant steady state However, it may outbursting systems, where temperature rises falls rapidly. Advection becomes dominant thick FU Orionis objects.