Term
| What does star formation generally occur from? |
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Definition
| the cores of giant molecular clouds |
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Term
| What two things do clouds need to do to form stars? |
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Definition
|
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Term
| What are the four factors that resist the collapse of a cloud? |
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Definition
1. thermal energy (pressure)
2. magnetic fields
3. rotation
4. turbulance |
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Term
| What is another word for rotation? |
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Definition
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Term
| Previous star formation can trigger new star formation through what four things? |
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Definition
1. shocks from supernovae
2. ionization fronts of hot massive O or B stars
3. collisions of giant molecular clouds
4. spiral arms in galaxies |
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Term
| What is the pre-birth state of a star known as? |
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Definition
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Term
| What is the state of a protostar? |
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Definition
| hydrogen to helium fusion not yet initiated |
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Term
| Do higher mass stars evolve more or less rapidly? |
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Definition
|
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Term
| What does conservation of angular momentum lead to the formation of? |
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Definition
|
|
Term
| what are protostellar disks? |
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Definition
| the birthplace of planets and moons |
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Term
| What are disk of matter falling onto a protostar known as? |
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Definition
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Term
| What are Herbig-Haro objects? |
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Definition
| Bipolar outflows die to accreted matter |
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Term
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Definition
| the line on the H-R diagram where a star emerges from the enshrouding dust cocoon |
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Term
| What does the cone nebula give us strong evidence for? |
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Definition
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Term
| What are newly forming stars exposed by the ionizing radiation from nearby massive stars called? |
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Definition
| evaporating gaseous globules (EGGs) |
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Term
| What are large groups of stars that are formed from large masses of giant molecular clouds? |
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Definition
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Term
| What cycle do stars about the mass of the sun produce less energy? |
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Definition
|
|
Term
| Through was cycle where stars slightly more massive than the Sun produce energy? |
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Definition
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Term
| The two methods of energy transport in the sun include: |
|
Definition
1. radiative energy transport
2. convection |
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Term
| How is energy generated in the sun? |
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Definition
|
|
Term
| The structure of the sun is the basically the same for the stars of what mass? |
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Definition
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Term
| Stars more massive than the sun have what kind of core and envelope? |
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Definition
| convective core, radiative envelope |
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|
Term
| What is hydrostatic equilibrium? |
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Definition
| the state of a star by which the inward gravity is matched by outward pressure |
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Term
| What does hydrostatic equilibrium determine? |
|
Definition
| interior structure of star |
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Term
| What triggers star formation? |
|
Definition
|
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Term
|
Definition
| small, dark nebulae which contract to form stars |
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Term
| How do stars make their energy? |
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Definition
| same way as sun, proton-proton chain |
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Term
| the CNO cycle is temperature sensitive. What is the minimum solar mass in which the CNO cycle will succeed? |
|
Definition
|
|
Term
|
Definition
| the resistance in a gas to the flow of radiation |
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Term
| What is the law of hydrostatic equilibrium? |
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Definition
| the weight pressing on a layer of gas in a star must be balanced by the pressure in the gas |
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