Term
| What four laws determine the structure and evolution of a star? |
|
Definition
1. hydrostatic equilibrium
2. energy transport
3. conservation of mass
4. conservation of energy |
|
|
Term
| What is the maximum mass of a main sequence star? |
|
Definition
|
|
Term
| Where do stars of a very high mass loss mass? |
|
Definition
|
|
Term
| What is the minimum mass of main sequence stars? |
|
Definition
|
|
Term
| Objects of mass less than .08 are called what? |
|
Definition
|
|
Term
| Why do stars have finite lifetime? |
|
Definition
| because they have a final supply of H |
|
|
Term
| Do massive stars have shorter or longer lifetime? |
|
Definition
|
|
Term
| What is the core filled with after Hydrogen is done burning? |
|
Definition
|
|
Term
| what exists around the core? |
|
Definition
| a shell of burning hydrogen |
|
|
Term
| When the star expands to become a red giant, what happens to the surface? |
|
Definition
|
|
Term
| True or false: at some point the sun will expand past the earths surface |
|
Definition
|
|
Term
| What is the new state called with Hydrogen in the core stops burning and the matter enters this new state? |
|
Definition
|
|
Term
| What happens in Triple Alpha Process? |
|
Definition
| helium is converted into carbon, oxygen and energy. (a core of C and O are formed) |
|
|
Term
| Stars more massive than _________ masses can fuse elements heavier than carbon and oxygen. |
|
Definition
|
|
Term
| Stars of mass less than 4 times the mass of the sun stop fusion at the formation of what? |
|
Definition
|
|
Term
| Stars of mass greater than 8 times the mass of the sun stop fusion at the formation of what? |
|
Definition
|
|
Term
| Which stars never burn anything heavier than hydrogen? |
|
Definition
|
|
Term
| What can be used as evidence of stellar evolution? why? |
|
Definition
| star clusters, because all the stars will have the same age |
|
|
Term
| More massive stars evolve more or less quickly than less massive stars? |
|
Definition
|
|
Term
| If the stars are plotted on a H-R diagram, what stars would be missing? |
|
Definition
|
|
Term
| What do mathematical stellar models show? |
|
Definition
| how rapidly a star uses its fuel in each layer |
|
|
Term
| What is the zero-age main sequence? |
|
Definition
| the line in the H-R diagram where contracting stars begin fusing hydrogen and reach stability |
|
|
Term
| What does the life expectancy of a main sequence star depend on? |
|
Definition
|
|
Term
| What does helium fusion produce? |
|
Definition
|
|
Term
| What are the two types of star clusters? |
|
Definition
1. open clusters
2. globular clusters |
|
|
Term
|
Definition
| contains 100 to 1000 stars and have open, transparent appearnce; young |
|
|
Term
| What are globular clusters? |
|
Definition
| 10^5 to 10^6 stars and are densely packed in a spherical shape; older |
|
|
Term
| What is the turn off point? |
|
Definition
| the location on the main sequence where the stars turn off to the right and become giants |
|
|
Term
| What is the difference between variable stars and intrinsic variable stars? |
|
Definition
variable stars: change in brightness
I.V.S: change in brightness because of internal processes |
|
|
Term
| What are two examples are proof that stars evolve? |
|
Definition
| the cepheid and RR Lyrae variable stars |
|
|
