Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.


Sign in to follow this  

[O III] versus [O I] in M27

Recommended Posts

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]:



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


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].

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.