Stars And Elementary Flashcards

1
Q

What is the distance modulus

A

m -M = 5log(d/10pc)

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2
Q

What is the flux apparent magnitudes relationship?

A

m1 - m2 = -2.5log(f1/f2)

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3
Q

What is the luminosity temperature relationship?

A

L = 4 pi r^2 Stefan Boltzmann T^4

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4
Q

What is wiens law?

A

Lambda max T = 0.0029

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5
Q

What is the focal ratio?

A

Focal ratio = fe/D

Where fe is the distance to the focal plane from the lens

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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

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7
Q

What is the equation for space motion?

A

s = root (vr)^2 + t^2

Radial velocity along the line of sight

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8
Q

What is the proper motion equation?

A

Mew = root (mew alpha cod declination)^2 + (mew declination)^2

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9
Q

Space motion and proper motion conversation?

A

t = 4.74 mew distance

Mew = arcseconds per year
Distance = parsecs
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