The Galaxy Flashcards

1
Q

What is the equation for hydrostatic equilibrium?

A

dP/dr = -GM(r)/(r^2) x p(r)

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2
Q

What are the equations and relationships for star lifetime on the main sequence?

A
  • t = fuel/ energy
  • t = Etotal/L
  • t proportional to m/L
  • Tms = Tsolar x (m/msolar)^-2.5
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3
Q

What are the equations that relate to dust shielding?

A
  • Av = 3.2E(B-V)

- m - M = 5logd -5 +Av

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4
Q

What are the equations for P Cygni lines?

A

Wind velocity = difference in wavelength/ peak wavelength x c

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5
Q

What is the equation for mass loss?

A

dM/dt = 4pi r^2 p(r)v(r)

where p(r) = density and v(r) = velocity

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6
Q

What is the equation for number density?

A

N = No e^ -|z|/H

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