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(luminosity) both stars at the same distance
-cant measure luminosity w/ out distance
radius of star
stefan boltemann's law-the hotter the object, the brighter the energy per unit area x temp^4
if the mass if below C.L then the gravitational pull is stuck and turns into a white dwarf. cant compress any further
steps of star:
1. main sequence
2. red giant
3. yellow giant
4. red giant
5. planetary nebula
not normal part of star, white dward and it happens to be w/ binary stars, its pulling materials from other stars, increasing its mass
white dwarf fuses and glows really bright blows material and goes out and then starts over the cycle
type Ia (super nova)
same as nova; explosion can occur when white dwarf is pulling material from other stars
death of a low mass star step of life cycle after red giant such. explosion, then turns to white dwarf
pulse slow- rapidly- near by ones how luminous it was went w/ how fast it pulsed
-how we measure the distance of the dragmatra galaxy (standard candle)
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