Card Set Information
Where a white dwarf is in a close binary is a ______.
Norae (Stellar Explosion)
What happens in a Type 1 Supernovae?
White dwarf in a binary (again.)
Mass transfer until >1.4 solar mass
Describe the mass and temperature in a Type 2 Supernovae.
Mass > 8 solar masses
Temperature > 10
What are some characteristics of Pulsars?
Rapid and very regular pulse period
Found in disk of our galaxy
Whear star-like object
What is the theory of Pulsars?
Dense objects can oscillate, rotate, and revolve rapidly
What are some predictions of relative motion?
Time intervals increase
Describe General Relativity.
no more restriction to constant velocities
a "new look at gravity"
Mass distorts the geometry of space
What are the four tests for verifying General Relativity?
Distortion of star positions near eclipsed sun
Energy loss to gravitational waves
A dark star of more than 7 solar masses, _____.
cannot be a white dwarf or neutron star
What happens around a black hole?
Supergiant fills its Roch lobe and loses mass
Infalling mass in 4-million km whirlpool around black hole
Describe the Milky Way's size and shape.
: 160,000 LY
: 1,000 LY
How long does it take to make one orbit of a Galactic Rotation?
230 Million years
What are some "Dark Matter Candidates"?
Dead Stars- White dwarfs, neutron stars, black holes
Brown dwarfs-objects too small to be stars
Population I in the galaxy. What is in it?
Gas and Dust
Population II. What is in it?
No Gas and Dust
Spiral arms can be traced by finding ____.
Gas and Dust
Older stars NOT concentrated in the arms
What is the Spiral Structure Theory?
Waves are spiral density waves
Influence of fresh, massive stars
Influence of nearby galaxies (tides)
Why is the Galactic center not seen at visible and UV wavelengths?
What do Infared, radio, and x-ray observations show?
Greater star density
High speed rotating disk of a few per radius
Galaxy type determined by ______.
Density (star formation rate)
Angular momentum (spin)
Interactions with neighbors
What indicates distance in galaxies?
What gives radial velocity in motion of galaxies?
What are the resilts of the mass of Galaxies?