Stellar Death Flashcards
(Outcome of stellar evolution) the star explodes, ejecting all of its matter into interstellar medium
Nothing/recycling
(Outcome of stellar evolution) degenerate core stays and slowly cools and fade
White dwarf
(Outcome of stellar evolution) extremely compact core stays behind when star explodes - will eventually fade
Neutron star
(Outcome of stellar evolution) singularity/point of infinite curvature left behind when star goes supernova
Black hole
(Supernovae) shows no hydrogen in their spectrum
Type I
(Supernovae) strong hydrogen in spectrum
Type II
(Supernovae) strong silicon
Type Ia
(Supernovae) He rich
Type Ib
(Supernovae) He poor
Type Ic
Luminosity/magnitude vs. time
Lightcurve
Star begins to collapse once core (degenerate) is iron (Fe) and no white dwarf or planetary nebula is left
Core-collapse supernovae
Photons break apart heavy nuclei
Photodisintegration
Escaping neutrinos cool the star as it collapses
Proto-neutron star
What powers supernovae
gravitational energy released from core collapse
Compressed neutrons will exert
Neutron degeneracy pressure
Rapidly spinning neutron stars that emit electromagnetic radiation
Pulsars
Electromagnetic radiation when charges follow curved path (non-thermal)
Synchrotron radiation
Spherically symmetric distribution of older stars
Halo
Distribution of stars orbiting galactic center on thin plane (pulsar dense)
Disk
Spherical distribution surrounding galactic center
Bulge
Beamed emission from poles of neutron star
Pulsar
Boundary beyond which light cannot escape black hole
Event horizon
