Lecture #11

Angular momentum conservation

Keeps spinning things spinning

Binary star crossing

Dim star obscure the bright one

Periodicity gives orbital information

Quiescent and active phases

Angular momentum flow outward

Mass flows inward

Clumps of mass fall onto WD

(more in Lecture #13)

Lecture #12

Black hole gravitational potential

Representation of 4-D in 2-D

Needle like funnel

Orbits described by rolling balls

Mass gets heavy enough, space will "pinch off" -- disconnect

Black holes have 3 qualities only

Angular momentum, mass, charge

Black holes can merge

Lecture #13

Light crossing time

Time scale of flickering indicate size

Black Hole formation

Single large mass star collapse

Two white dwarfs merge

Accretion disks around a W.D.

Turbulence causes friction

Mass absorbed onto star -- flare

Damps down turbulence

Accretion disk mass increase