Solving Stellar Structure: Pressure & Temperature Stratification

  • Thread starter Thread starter atomqwerty
  • Start date Start date
  • Tags Tags
    Stellar Structure
Click For Summary
SUMMARY

The discussion focuses on deriving the pressure and temperature stratification in a star, using the density equation p = pc(1 - r/R). The equilibrium equation dP/dr = -Gm(r)p/r² and the continuity equation dm/dr = 4πr²p are utilized to find the pressure distribution P(r). The ideal gas law, rewritten in terms of density, is suggested as a method to establish a relationship between temperature and pressure. The participants confirm the successful derivation of P(r) and explore the implications for temperature stratification.

PREREQUISITES
  • Understanding of stellar structure and hydrostatic equilibrium
  • Familiarity with the ideal gas law (PV = nRT)
  • Knowledge of differential equations in physics
  • Basic concepts of density and its relation to pressure and temperature
NEXT STEPS
  • Explore the derivation of the ideal gas law in terms of density
  • Study the application of the continuity equation in astrophysics
  • Research the implications of temperature stratification in stellar evolution
  • Learn about the gravitational forces acting on stellar bodies
USEFUL FOR

Astronomy students, astrophysicists, and anyone studying stellar dynamics and thermodynamics will benefit from this discussion.

atomqwerty
Messages
89
Reaction score
0

Homework Statement



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.

Homework Equations



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

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

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

The Attempt at a Solution



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

Thanks!
 
Physics news on Phys.org
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.
 
ideasrule said:
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
 

Similar threads

Replies
4
Views
3K
Replies
6
Views
3K
Replies
1
Views
2K
  • · Replies 18 ·
Replies
18
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 35 ·
2
Replies
35
Views
6K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 14 ·
Replies
14
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 9 ·
Replies
9
Views
1K