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19 Cards in this Set
- Front
- Back
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Kiloparsec |
1,000 PC - 3300 ly (a unit of distance) |
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Cephic Variable Stars |
Stars w/ pulsation of 1-60days. Variation=Luminosity |
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Instability Strip |
Region on H-R diagram. Stars are unstable to pulsation. |
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Period Luminosity |
Relationship of period of pulsation and instinsic brightness |
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Proper Motion |
The rate which a star moves across the sky per arc second |
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Disk Component |
Material confined to the plane of a galaxy |
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Spherical Component |
All the matter in a galaxy in a spherical distribution around the center |
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Halo |
Spherical thing region of galaxy of star material |
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Central Bulge |
The cloud that lies center of spiral galaxy |
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Rotation Curve |
A graph of orbital velocity versus radius |
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Dark Matter |
Nonluminious matter that is detected only by gravitational influence |
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Spiral Tracer |
Objects used to mark the spiral arms |
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Spiral density wave theory |
Spiral arms are compression disk |
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Self-Sustaining Star Formation |
When one star forms more stars |
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Population 1 Star |
Stars with atoms heavier than helium, usually young stars |
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Population 2 Star |
Stars poor in atoms heavier than hellium, older stars |
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Metal |
All atoms heavier than hellium |
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Monolithic Collapse |
A hypothesis that says the galaxy formed from the collapse of a single large cloud of turbulent gas |
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Sagittarius A |
Radio source at core of milky way galaxy |
