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Terry thanks for that.
Now some objects emit in H alpha and other in H beta, is this to do with the abundance of different isotopes of hydrogen in the nebula, with the abundance of different isotopes of hydrogen in the star, differences in the energy emissions of the star or some other mechanism?
Similarly. for nebula prominent in OIII and SII line filters, is this because of different energy emissions from the star, the relative abundance of these elements in the star. or is it to do with the relative abundance of these elements in the gas cloud that is emitting or reflecting the light from the star?
Or have I completely misunderstood your answer?!!!
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