Quote:
Originally Posted by Terry B
Interesting and great images Pete
I looked at the spectra change for the dates you have. My dates are slightly different but this shouldn't matter too much. There was a relative reduction in the overall magnitude including the hydrogen lines between 28th Dec and 11th Jan. There was however a relative increase in the strength of the Ha and Hb lines by the 11th Jan. The continuum for the nova is relatively blue and this is the colour in your image. I think that the reason you have a blue star image is that this is a very bright star compared to the background and very easily saturates the CCD. My ST10XME saturated the nova through any filter with a 5 sec exposure. Your camera has great antiblooming so you don't see the saturation compared to my camera. (my images are also for photometry so they must not saturate to be able to measure them)
I think that any deep red from the Ha has been saturated. I have attached comp graphs of the spectra for the 2 days and they show you the change in the spectra.
Cheers
Terry
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Thanks Terry
I feel much better about my processing in light of your comments. I was initially bummed that I didn't have the rose hue of Rolf's early image but I understand now why it appears blue.
I will revisit this target in a week or 2 - how is it placed now? I hope its closer to midnight than last year
Pete