Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  NGC 6888
Crescent Nebula and spectrum of wolf-rayet star, Remco Kemperman
Crescent Nebula and spectrum of wolf-rayet star
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Crescent Nebula and spectrum of wolf-rayet star

Crescent Nebula and spectrum of wolf-rayet star, Remco Kemperman
Crescent Nebula and spectrum of wolf-rayet star
Powered byPixInsight

Crescent Nebula and spectrum of wolf-rayet star

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The star in the middle nebula is Wolf rayet star WR136.[color=var(--lighterGrey)]It 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. Which can be seen in the relatively week hydrogen emission lines in the star. [/color]Helium an nitrogen lines however , are stronger. We are looking at deeper layers of the star. And it is hot, 70.000 Kelvin! 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
the spectrum was taken with a staranalyzer gratingThe image with Ha and Oiii filters

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Crescent Nebula and spectrum of wolf-rayet star, Remco Kemperman