Stellar Evolution Review

4. a magnitude 2.5 star is ____________ than a magnitude 3.5 star
8. this type of supernova is the result of one star accreting mass from a companion
9. the sun is categorized as this type of star
12. this is the order of the letters for stellar classifications
14. In a massive star, it takes a single _____ to fuse all silicon into iron
15. Betelgeuse is this type of star (color and size)
16. type 1a supernovae require _________ star(s)
17. a star will fuse helium much _____________ than hydrogen
19. given a fixed volume, if pressure increases then ___________ increases
20. The Sun will ends its life cycle as a white dwarf with carbon and _________ as the only remaining elements
22. A blue star is typically ___________ than a red star
24. type 2 supernovae that create black holes must start with a mass of _________________ times more than the Sun
25. fusing iron (or in some cases, carbon) causes this to happen
27. The energy of fusing in the core of stars is the only thing preventing a star from dying due to its own ______________
28. stars with more mass live much _________ lives than low mass stars
30. in order to fuse hydrogen into helium, the core of a star needs to reach 15 _______ Kelvin
31. type 2 supernovae require _________ star(s)

1. fusing helium produces more ____________ than fusing hydrogen
2. Compared to other stars, the Sun is relatively _________ in size
3. this section of the Hertzsprung-Russell Diagram is below the main sequence
4. over half of the stars in the night sky are in a ___________ system (they have a companion)
5. this area of the H-R Diagram is where most stars fall.
6. this is the stage of a low mass (but not too low) star after the red giant phase
7. this is the name of the stage of a star before it starts fusing hydrogen
10. there are _________ high mass stars than there are low mass stars
11. Given a fixed temperature, if pressure increases then _______________ decreases
13. Supernovae are the only natural way that elements heavier than ______ are created
14. the force that keeps white dwarfs from collapsing is called electron ___________ pressure which occurs because electrons don’t like being near each other
18. Hot stars are typically brighter or more ____________ than cooler stars
21. The Sun’s stellar classification is _______
23. after hydrogen, the most common element in stars is
26. K type stars are typically what color?
29. O type stars are typically what color?