Stars And Elementary Flashcards
1
Q
What is the distance modulus
A
m -M = 5log(d/10pc)
2
Q
What is the flux apparent magnitudes relationship?
A
m1 - m2 = -2.5log(f1/f2)
3
Q
What is the luminosity temperature relationship?
A
L = 4 pi r^2 Stefan Boltzmann T^4
4
Q
What is wiens law?
A
Lambda max T = 0.0029
5
Q
What is the focal ratio?
A
Focal ratio = fe/D
Where fe is the distance to the focal plane from the lens
6
Q
What is the angle telescope relationship?
A
Alpha = 1.22 lambda/ D
When alpha is in radians
Alpha = 2.5x10^5 lambda/ D
When alpha is in arcseconds
7
Q
What is the equation for space motion?
A
s = root (vr)^2 + t^2
Radial velocity along the line of sight
8
Q
What is the proper motion equation?
A
Mew = root (mew alpha cod declination)^2 + (mew declination)^2
9
Q
Space motion and proper motion conversation?
A
t = 4.74 mew distance
Mew = arcseconds per year Distance = parsecs
