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riklaunim

[O III] versus [O I] in M27

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I'm trying to shoot a nice "neutral oxygen" images of M27 and M57 but I constantly have some clouds just waiting for me to put the scope out...

At the moment I just have this:

[O III] and [O I]; TSAPO65; 3 minute exposures. 15 frames for [O III], 8 for [O I]:

m27-o3.jpg

m27-o1.jpg

[O I] 30 x 5 sec, C11 at f/6.3, bin2; no dark/flat:

o1-sct.jpg

It needs longer exposures, but it does look like in the book. The [O I] at 630 nm is a "neutral oxygen" emission line, different from the commonly used [O III]. Usually it can be found glowing further away from the ionizing star/white dwarf, but in some planetary nebulae higher density condensations present in the nebula can glow in [O I] (like M27). The emission line isn't strong, similar to [s II] in intensity.

To shoot the [O I] I used a EO bandpass filter and Baader filter for the [O III].

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