Fluxes and Magnitudes Flashcards
1
Q
What is the luminosity of an object?
A
The power output of that object
2
Q
What is the equation for flux?
A
f =L/(4πd^2)
Where L is the luminosity and d is the distance
.
3
Q
What magnitude is considered to be the brightest?
A
1
4
Q
What magnitude is considered to be the faintest?
A
6
5
Q
How do magnitudes and fluxes relate?
A
m2 − m1 = −2.5log_10(f2/f1)
,
6
Q
How do we find the apparent magnitude of an object?
A
Use Vega as a zero point
m=−2.5log_10(f/f_vega)
7
Q
What is the absolute magnitude of an object?
A
Its apparent magnitude at a distance of 10pc
8
Q
How do we relate absolute and apparent magnitude?
A
m−M=5log_10(d/10pc)
