00:01
All right, so let's say we have a star a and then another star b and then another star c, and we're given sort of their spectral, or their spectral radiance as a function of wavelength.
00:16
So for a, it kind of looks like this, and that's a pretty crude approximation, but the peak appears to be around 800 nanometers or so.
00:27
And then for star b, we have a curve that looks like this.
00:32
The peak here occurs at about maybe 440 nanometers or so.
00:41
And then for our star c, if we draw this one, it's kind of similar to b.
00:47
The peak occurs at about 490 nanometers.
00:54
And so the spectral class of these, so that the temperature we know from wein's law is going to be 0 .0, or we'll write it 2 .9 million nanometers times a kelvin over the peak wavelength.
01:10
So the temperature of star a is probably in the ballpark of 3600 kelvin.
01:16
The temperature of star b is in the ballpark about 6600 kelvin...
