exam 2
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18 Terms
1
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blackbodies
* idealized that absorbs all radiation that falls onto it
* perfect emitters of radiation
* perfect emitters of radiation
2
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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
* relates the temperature of an celestial object by analyzing light color
* short wavelength = blue, hot
* long wavelength = red, cold
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how hot is the sun
5800 K
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spectral class
O B A F G K M
* O = bigger, hot, blue
* M = small, cool, red
* O = bigger, hot, blue
* M = small, cool, red
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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
* don’t sustain fusion in core due to lack of sufficient mass
* lower limit: 80 jupiters OR 8% of suns mass
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luminosity
relies on surface temp and size
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most important property of a star
mass
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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
* 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
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stefan - boltzmann law
* AT^4 = total energy
* a = area
* t = temperature
* relationship b/w temp & radiation emitted
* increase temp = increase radiation emission
* a = area
* t = temperature
* relationship b/w temp & radiation emitted
* increase temp = increase radiation emission
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variable stars
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Note 
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