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Advective Disks
Ramesh Narayan
Recent work on advection-dominated accretion flows (ADAFs) is reviewed. The article concentrates on an optically thin branch of ADAFs which is present at mass accretion rates below…
Lithium Production in Hot Advection-Dominated Accretion Flows in Soft X-Ray Transients
Insu Yi, Ramesh Narayan
High Li abundances have been reported in the late type secondaries of five soft X-ray transients (SXTs), V404 Cyg, A0620-00, GS2000+25, Nova Mus 1991, and Cen X-4. Since Li is like…
Advection-Dominated Accretion Model of the Black Hole V404 Cyg in Quiescence
Ramesh Narayan, Didier Barret, Jeffrey E. McClintock
We have analyzed archival ASCA data on the soft X-ray transient source V404 Cyg in quiescence. We find that in the energy range 0.7 to 8.5 keV the spectrum is a hard power-law with…
Global Structure and Dynamics of Advection-Dominated Accretion Flows Around Black Holes
Ramesh Narayan, Shoji Kato, Fumio Honma
We present global solutions that describe advection-dominated accretion flows around black holes. The solutions are obtained by numerically solving a set of coupled ordinary differ…
Spectra and Line Profiles of FU Orionis Objects: Comparisons Between Boundary Layer Models and Observations
Robert Popham, Scott Kenyon, Lee Hartmann +1
We present solutions for the accretion disks and boundary layers in pre-main-sequence stars undergoing FU Orionis outbursts. These solutions differ from earlier disk solutions in t…
Lectures on Gravitational Lensing
Ramesh Narayan, Matthias Bartelmann
These lectures give an introduction to Gravitational Lensing. We discuss lensing by point masses, lensing by galaxies, and lensing by clusters and larger-scale structures in the Un…