W9b properties of stars Flashcards
(5 cards)
1
Q
mass is…
A
effectively constant through life of most stars
though stars may lose material toward end of life
2
Q
Luminosity is the…
A
brightness of star, how much energy it sends into space; can change very much for same star as it evolves and inner structure change
3
Q
lifetime (age) depends on…
A
mass (amt. of fuel) and luminosity (rate of usage for fuel)
4
Q
surface temperature determines…
A
how energetic (hot/cool) photons are that are radiated by surface
- follow Wein’s law
- depends on luminosity and size of star
5
Q
radius (size) changes…
A
drastically during late life evolution
