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ASTRO: Nova Delphini 2013 revisited 25 days later
I originally imaged Nova Delphini 2013 on August 29. I've tried several
time since to reimage it to see if it changed but the weather has made a mess of all attempts. Now with it being over a month later and the moon in the area, I went through all the attempts and found one that was sort of usable. Seeing was poor by comparison so stars are much larger. This makes them appear brighter but I've actually processed them virtually the same. The difference is just due to seeing and changes in transparency. The second attempt was taken September 23 so 6 days shy of a month later. Two differences are obvious. First it has changed color. This was rather expected. Many nova (but not the previous nova in Delphinus in 1967) blow out huge shells of hydrogen gas that glows in typical hydrogen alpha red and weaker hydrogen beta blue-green. Since the red dominates the star appears to turn red though it is actually the as yet unresolved hydrogen shell it expelled that gives it the red color. The star is still blue hot from the eruption. The other change, also as expected (but again not the case with the 1967 nova in Delphinus) is that it has gotten fainter. I've included a side by side comparison as well as the full frame from September. Both the August and September images were taken precisely the same way in order to try and preserve comparability. I should add that while the nova appears to have a red halo about it that is just glare from the star being so bright. This is the same as the blue glare around the earlier image but colored by the H alpha shell. The actual hydrogen shell is still an unresolved point source same as the star itself. 14" LX200R @ f/10, RGB=1x10' each, STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net |
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