Crescent nebula and spectrum of WR 136 (Remco Kemperman)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888

Crescent nebula and spectrum of WR 136, Remco Kemperman

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Crescent nebula and spectrum of WR 136

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Crescent nebula and spectrum of WR 136

See that star in the middle of the Crescent nebula?
That is the Wolf Rayet star WR136 that has expelled a lot of its outer layers allready. This is what makes the Crescent nebula. A lot of hydrogen of the star is allready gone.

Wolf Rayet stars are the last stage of massive O-type stars before they go supernova. The star is allready instable and expelling its outer layers.
A Wolf-Rayet star is classified by the amount of its shell that is allready gone. This one as a WN5 star.

The N in WN stands for Nitrogen. in WN5 star WR136 (in the crescent nebula) there is still quite a lot of Hydrogen and helium visible. And we don't see as far into the star as we do not see that mucht Carbon yet.

These kinds of stars are quite rare because the live fast and there are very little O-type stars in the first place. We know of only 220 wolf rayet stars in the Galaxy at the moment, and most of them are found in the southern skies.

We find these kinds of stars in the busy parts of the galaxy, where there is starformation going on.

Spectra were taken from the backyard with:
Skywatcher 150/750PDS on HEQ5 mount
QHY 294M camera
Star analyzer 100 diffraction grating
spectra were analyzed with R-spec Astro.

The image was taken with the same system with a 12nm Ha filter
76x5 minute exposures, and processed in PixInsight

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Status	Basic success
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Astrometry.net job	5010100
PixInsight job	n/a
PixInsight queue size	n/a
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Crescent nebula and spectrum of WR 136

Crescent nebula and spectrum of WR 136

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Crescent nebula and spectrum of WR 136

Crescent nebula and spectrum of WR 136

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