As Wikipedia says:
Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon. The spectra indicate very high surface enhancement of heavy elements, depletion of hydrogen, and strong stellar winds. The surface temperatures of known Wolf–Rayet stars range from 20,000 K to around 210,000 K, hotter than almost all other kinds of stars. They were previously called W-type stars referring to their spectral classification.
I present my last image showing WR134. It is taken with two filters (Halpha/OIII).
The red in the image shows the presence of hydrogen, while the green is oxygen. We’re just stardust …
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Lights (filter H-alpha): 8 x 600 sec
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Lights (filter OIII): 26 x 600 sec
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Total lights integration time: 5:40 hours
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Imaging telescope / lens: Takahashi Apochromatic 60/370 mm FS-60CB
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Imaging camera: ZWO Optical ASI 2600MM (CMOS)
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Mount: Equatorial iOptron Zeq25
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Guiding telescope / lens: Orion Achromatic 50mm/162 mm
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Guiding camera: ZWO Optical 290MM
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Processed with: Siril 1.3.0
