Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  27 Cyg  ·  28 Cyg  ·  29 Cyg  ·  NGC 6871  ·  NGC 6883  ·  The star b1 Cyg  ·  The star b2 Cyg  ·  The star b3 Cyg
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Wolf-Rayet 134 Ejections, M.J. Post
Wolf-Rayet 134 Ejections
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Wolf-Rayet 134 Ejections

Getting plate-solving status, please wait...
Wolf-Rayet 134 Ejections, M.J. Post
Wolf-Rayet 134 Ejections
Powered byPixInsight

Wolf-Rayet 134 Ejections

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Description

This WR star is one of three in Cygnus first discovered by Wolf and Rayet in 1867 to have unusual emission lines in their spectra.  These emission lines are due to excitation of expunged gases by the star's UV radiation, and subsequent return to a lower energy state.   Normal stars primarily display absorption lines in their spectra.  This star is also randomly variable on time scales of hours to days.  Sometime in its past, apparently, a large quantity of dense oxygen was ejected to the northwest, the teal-colored arc that is now constantly bathed in the star's UV output and emits strongly at the OIII wavelength of 501 nm.  In this image I was please to have also captured some of the lower density oxygen material ejected spherically by the central WR star.

This is a modified HOO image.   H and S images share the red channel,  O is in both green and blue channels, and a bit of S is added to both green and blue channels to  help make stars more realistic.

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Wolf-Rayet 134 Ejections, M.J. Post