COBRA Discussion Group
Almog Yalinewich
8.3.19
A picture is worth 1000 words
Less massive but more evolved
Mass transfer
Eclipsing Binary
Very short period (12h), sma
K type
white dwarf
NGC 6720, The Ring Nebula
NGC 6543, the Cat's Eye Nebula
Accretion onto Companion
Companion Spin
Recombination
Energy sink - binding energy to companion
+fusion
Technically, the envelope is unbound
Mass ratio
Angular momentum
after mass transfer
Stable
Unstable
Progressive
unstable
Regressive
stable
insert snide political comment
Tight
binaries
favour
large q
Inherently 3D
Self Gravity
Multiscale
Radiation
Rapid braking
Slow braking
high eccentricity
low eccentricity
Without radiation
Eddington limit
Jet formation?
Adiabatic
Radiative
Tenuous atmosphere
Different from low mass stars
Envelope retained
More Eccentric
Larger separation