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blackbodies
idealized that absorbs all radiation that falls onto it
perfect emitters of radiation
wien’s law
Λ : b / T
relates the temperature of an celestial object by analyzing light color
short wavelength = blue, hot
long wavelength = red, cold
how hot is the sun
5800 K
spectral class
O B A F G K M
O = bigger, hot, blue
M = small, cool, red
brown dwarfs
failed stars
don’t sustain fusion in core due to lack of sufficient mass
lower limit: 80 jupiters OR 8% of suns mass
luminosity
relies on surface temp and size
most important property of a star
mass
HR Diagram
top
left: shorter life, larger mass
big stars
bottom
right: longer life, small mass
small stars
increase in radius approaching top right
left
hot stars
right
cool stars
stefan - boltzmann law
AT^4 = total energy
a = area
t = temperature
relationship b/w temp & radiation emitted
increase temp = increase radiation emission
variable stars
Note 
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