Syllabus

Introduction: Accretion as a source of energy --- observational consequences. Accretion in binary system: Introduction --- Interacting binary system --- Roche lobe overflow --- Disk formation --- Viscous torque --- The α disk viscosity --- Low and high-mass X-ray binarie s. Accretion disk (thin accretion disk) Theory: Basic concepts --- Structure of thin disk --- The emitted spectrum of steady α -disk --- Time dependence and stability --- the the rmal disk instability model (dwarf novae) --- wind accretion --- Disk around young stars --- confrontation with observations. Accretion on to compact object: Boundary layers --- Accretion on to magnetized neutron star and white dwarf --- accreti on column --- accretion on to black hole. Accretion disk in AGN: AGN models --- Radio, millim eter and infrared emission --- optical, UV and X-ray emission --- broad and narrow line region --- Extended and compact radio sources --- The Blandford-Znajek model. Thick discs: The limiti ng luminosity --- accretion tori --- self- gravitating disks and their stability --- astrophys ical implication. Accretion flows: The governing equations --- A unified description of steady flow --- advection-dominated flows --- general transonic accretion solution in presence of heating and cooling