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? Spectral width of emission lines
This came up as a result of reading/thinking about narrow band imaging and I haven't been able to find an answer, even though it's probably astrophysics 101.
The number of photons that can be detected is proportional to the bandwidth of the signal.
So if you were pointing at a pure H-a source, how wide (in nm) is the signal source ?
I'm not asking about the filter, but the light coming from the nebula or whatever.
Steve.
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