Astronomy Final 2
About this set
Created by:
danielletrap on December 9, 2011
Subjects:
Description:
Unit Two
Log in to favorite or report as inappropriate.
Order by
29 terms
Terms | Definitions |
|---|---|
 Chandrasekhar Limit | max mass a white dwarf can be more than 1.4, gravity takes over pressure carbon fuses Results in a type Ia supernova |
| CNO Cycle | Upper main sequence stars fuse Hydrogen |
| Triple Alpha Process | Helium will fuse into Carbon and Some Oxygen |
| The Phases of Star Formation | Molecular Cloud Fragmentation Herbig-Haro Object Red Protostar |
| Thermal Emission | Radiation from a heated object |
| Spectral Types from Hot to Cold | O: blue B: blue/white A: white F: yellow-white G: yellow K: orange M: red |
| Escape Velocity | speed of light: schwarzschild radius less than: outside event horizon greater than: inside event horizon |
| Redshifts and Blueshifts | moving away moving towards |
| Sirius B and the Sun | Sirius B is less luminous and smaller |
| Parsec | Distance where star's parallax is an arcsecond |
| Where were the heavy elements formed? | Inside giants and supernovae |
| What does absolute magnitude tell us? | How bright a star would appear if it were 10 parsecs away |
| Which element can't have nuclear energy extracted? | Iron |
| Herbig-Haro Objects | Protostars with jets |
| When is a protostar officially a star? | When fusion supports the weight of the star |
| What is a Star's Final Position on the Main Sequence Determined by? | Its mass |
| What are stars on the Main Sequence fusing? | Hydrogen into Helium |
| Main Sequence Stars | radiation in core, convection in envelope p-p cycle convection in core, radiation in envelope cno cycle |
| Population One and Two Stars | young 2-3% metallicity open cluster old less than 1% metallicity globular cluster |
| Pulsars | slowing rate of spin pointed at us all are spinning neutron stars |
| Our Galaxy's Disk | always rotates with the same speed sun's location |
| Our Galaxy's Halo | dark matter globular clusters M stars red giants |
| Our Galaxy's Bulge | 3.7 million solar mass black hole |
| Where are Open Clusters Found? | Only in the spiral arms |
| What does Cold Hydrogen Produce? | Radio Photons |
| Interferometry | -The light of multiple telescopes is combined to make one big telescope -Improves resolution of radio telescopes |
| What Type of Star Makes a He White Dwarf? | Red Dwarf not enough time to let a red dwarf die there are no He white dwarfs |
| Strongest Hydrogen Balmer Line | Type A |
| Type M | Most H is neutral most electrons in ground state of H Balmer lines are weak |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.