Stellar structure


by atomqwerty
Tags: astrophysics, stellar
atomqwerty
atomqwerty is offline
#1
Apr23-11, 12:37 PM
P: 95
1. The problem statement, all variables and given/known data

Let be the density given by the expression p = pc(1-r/R) where R is tha radius of the star. Find the stratification for pressure and temperature.

2. Relevant equations

Equilibrium eq. dP/dr = -Gm(r)p/r2

Continuity eq. dm/dr = 4*Pi*r2p

PS.: p == rho (sorry for not using TeX)

3. The attempt at a solution

The main problem is how to find the temperature stratification... maybe using the ideal gas equation PV =nRT?

Thanks!
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ideasrule
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#2
Apr23-11, 09:47 PM
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Have you already found the pressure distribution? If so, try rewriting the ideal gas law in terms of density, by multiplying both sides of PV=nRT by molar mass.
atomqwerty
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#3
Apr26-11, 06:45 AM
P: 95
Quote Quote by ideasrule View Post
Have you already found the pressure distribution? If so, try rewriting the ideal gas law in terms of density, by multiplying both sides of PV=nRT by molar mass.
Yes, I've found P(r) using Equilibrium equation, now if I write P=puRT (p:density; u:molar mass) and p=pc(1-r/R). Then I Have a relation between T and p, is that right?

thnk


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