- #1
Lucy_1192
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- TL;DR Summary
- I’m a bit confused about how different equations relate to each-other, and it seems contradictory?
For a star..
Apparent Magnitude = -2.5log10 I K
And I = I0/d^2
So in terms of I0...
Apparent Magnitude = -2.5log10 (I0/d^2)
And the Stefan-Boltzmann law says:
Energy Flux = Sigma(T^4)
In my reading it says that Intensity is the energy emitted per unit of area per unit of time. It says the same about Energy Flux, so are they the same?
If they are then could you say...
Apparent Magnitude = -2.5log10 [(Sigma T^4)/d^2] K
So could you say the Magnitude of a star is determined by Distance and Temperature and not on the Luminosity which is dependent on its radius?
Luminosity = (4piR^2) (Sigma T^4)
If that was the case then you’d be able to measure the distance to stars knowing only it’s apparent magnitude and temperature (from its peak wavelength) which doesn’t sound right?
Apparent Magnitude = -2.5log10 I K
And I = I0/d^2
So in terms of I0...
Apparent Magnitude = -2.5log10 (I0/d^2)
And the Stefan-Boltzmann law says:
Energy Flux = Sigma(T^4)
In my reading it says that Intensity is the energy emitted per unit of area per unit of time. It says the same about Energy Flux, so are they the same?
If they are then could you say...
Apparent Magnitude = -2.5log10 [(Sigma T^4)/d^2] K
So could you say the Magnitude of a star is determined by Distance and Temperature and not on the Luminosity which is dependent on its radius?
Luminosity = (4piR^2) (Sigma T^4)
If that was the case then you’d be able to measure the distance to stars knowing only it’s apparent magnitude and temperature (from its peak wavelength) which doesn’t sound right?