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NGC 6905 Blue Flash Nebula NGC6905 - RGB and combinations with Nii, Sergei

NGC 6905 Blue Flash Nebula NGC6905 - RGB and combinations with Nii

Revision title: Nii + RGB crop

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Description

Blue Flash nebula here imaged in RGB broadband and also combined with Nii signal imaged with 3nm filter. Combination of data acquired with a 7" refractor and a 12.5" CDK.
Nii jets visible at the two 'poles', one partially obstructed by an unrelated star. Such Nii jets are not uncommon in planetary nebulae, my gallery contains several other examples.

The central star HD 193949 belongs to [WO]-class of Wolf-Rayet-type stars, has a radius of about 0.15 solar radii, mass of approximately 0.6 solar masses, and  temperature in the range of 150,000K–165,000K.

It was studied by a group of scientists using multi-spectral imaging and results published:
https://arxiv.org/abs/2110.09551

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Revisions

  • NGC 6905 Blue Flash Nebula NGC6905 - RGB and combinations with Nii, Sergei
    Original
  • NGC 6905 Blue Flash Nebula NGC6905 - RGB and combinations with Nii, Sergei
    B
  • NGC 6905 Blue Flash Nebula NGC6905 - RGB and combinations with Nii, Sergei
    C
  • Final
    NGC 6905 Blue Flash Nebula NGC6905 - RGB and combinations with Nii, Sergei
    D

B

Title: NGB (Nii used as R, G and B are broadband images)

Uploaded: ...

C

Title: RGB + Nii combination

Uploaded: ...

D

Title: Nii + RGB crop

Uploaded: ...

Histogram

NGC 6905 Blue Flash Nebula NGC6905 - RGB and combinations with Nii, Sergei