lec22 - Lecture 22 Interstellar Dust Lecture 22 Purdue...

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Lecture 22 Interstellar Dust Purdue University, Astronomy 364 1 Lecture 22
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Reminder • HW04 is ready to be picked up. • HW05 due now! Will be ready for pick-up on March 16. • HW06 has been posted. Due: March 23. • Exam #2 on March 23 8-9 pm in Rm 203 (PHYS). Details can be found on the course web page. Lecture 22 Purdue University, Astronomy 364 2
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Equations of Stellar Structure Lecture 22 Purdue University, Astronomy 364 3 Hydrostatic equation: dP dr = GM ( r ) ρ ( r ) r 2 Equation of mass continuity: dM dr = 4 π r 2 ( r ) Equation of energy transport: dT dr = 3 κ ( r ) ( r ) L ( r ) 64 πσ SB r 2 T ( r ) 3 or dT dr = 1 1 γ T ( r ) P ( r ) dP dr Equation of energy generation: dL dr = 4 r 2 ( r ) ε ( r )
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• Equation of state – Ideal gas law • Mean molecular mass – Function of density and temperature • Opacity – Function of density and temperature • Energy generation rate – Extremely sensitive to temperature, ~ T 20 , for the pp chain. • Boundary conditions
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lec22 - Lecture 22 Interstellar Dust Lecture 22 Purdue...

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