Q - Physics
Q - Physics
Q - Physics
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⎛<br />
⎜<br />
⎝<br />
Equilibrium Temperature for a<br />
Single Grain:<br />
L star<br />
4πr 2<br />
⎞<br />
⎟ πa2<br />
⎠<br />
( ) Q vis<br />
E in<br />
= E out<br />
( ) = 4πa 2<br />
( )( σT 4<br />
) Q IR<br />
( )<br />
T = 1 r<br />
⎛<br />
⎜<br />
⎝ 16πσ<br />
L star<br />
Q vis<br />
Q IR<br />
⎞<br />
⎟<br />
⎠<br />
1<br />
4<br />
K<br />
For the case where L=L Sun<br />
and Measuring r in AU:<br />
T = 278.3<br />
r AU<br />
⎛<br />
⎜<br />
⎝<br />
Q vis<br />
Q IR<br />
⎞<br />
⎟<br />
⎠<br />
1<br />
4
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