Exotic narrowband with M57 - Helium and Argon

[riklaunim]

Fighting with clouds, balcony roof and so on I've managed to get a first light out of few narrowband industry filters matching He-I, He-II and Ar-III emission lines. Target: Ring Nebula.

UHC, O-III and H-a: 40-60 frames, 5 sec

He-II: 60 frames, 15 sec

Ar-III: 9 frames, 15 sec

No guiding and precise work

Standard version: UHC-Ha,O3,O3; DSI III Pro bin2, C11 f/10

HELIUM

Ha,O3,He2

UHC-Ha,O3,He2

H-alpha

O-III

He-II

Ar-III

[riklaunim]

Using the data from Spectrum Display Page it is possible to check the strength of each emission band (as showcased below, note that O-III is at different scale).

In PN oxygen usually will dominate, then N-II and or H-a. After those there is helium and even lower Ne-III and Ar-III. Depending on target He-I or He-II will be much stronger than the other (it seems so). He-I is only few nm from primary emission band of high pressure sodium lamps - so light pollution will affect it.

He-II is used by Richard Crisp Welcome to narrowbandimaging.com - much better images on his website :]

Ne-III

Ar-III

H-alpha and N-II

O-III

He-I

He-II

S-II

[NickK]

He-II is used by Richard Crisp Welcome to narrowbandimaging.com - much better images on his website :]

You're not wrong! His M42 is gobsmaking!

http://www.narrowbandimaging.com/images/m42_ap155edf_f7_pl3200_cs3_s2hao3_299x90sec_svga.jpg

What's interesting in your He-II is the central star inside the nebula - is this the remnants of the original star I wonder?

[riklaunim]

I've wrote a short description about those bands and filters on my website

[keithmrris]

Great pic well done!