Black hole accretion disk "string theory" model

http://heasarc.gsfc.nasa.gov/docs/xte/outreach/HEG/bhm/bhm_intro.html
Kimberly S. Adams, Argyle Middle School, Silver Spring, MD

Astronomy 10 learning goal Q10.3

Simple model of mass transfer from a giant/supergiant to a black hole.   Conservation of angular momentum from the orbits of this binary system results in the mass transferred from the giant/supergiant forming an accretion disk around the black hole, rather than falling "straight in."