Quote:
Originally Posted by Merlin66
Mike,
Not sure what you want to achieve - pretty pictures in "different" wavelength colours 0r to use your filters as Photometric filters?
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Ken,
Thanks for your thoughtful reply. I am very much hoping that there is a third option. Pretty pictures implies a total lack of understanding of what one is looking at, or, put another way, that the pictures are totally lacking in information content, that all the coffee table books and shots published by NASA and ESO are devoid of information, and just a con. I don't believe that.
Even in monochrome, we can see dust lanes, super-bubbles, shock fronts, cometary knots, collimated jets and HH objects, so the pictures are not just pretty abstract paintings.
I mentioned when posing my question that the relative distributions of H-alpha and OIII seem to tell us quite a lot about what we are looking at.
I should like to know whether the morphological distributions of SII and NII relative to the others tells us anything extra, and if so, what.
I have read Kaler, and believe that I understand him. But he does not specifically address my questions: what
kinds of objects are especially rich in SII or NII? What does that tell us? Name some objects?
Best,
Mike