Distance and Intrinsic Brightness
Betelgeuse
Rigel
Example:
App. Magn. mV = 0.41
Recall:
(2.512)5 = 100
5
…
…
2.512*2.512 = (2.512)2 = 6.31
2
2.512
1
Intensity Ratio
Magn. Diff.
App. Magn. mV = 0.14
For a magnitude
difference of 0.41 – 0.14 = 0.27, we find an intensity ratio of (2.512)0.27 = 1.28
