NGC 3199: A WR Nebula (Alex Woronow)

Celestial hemisphere: Southern · Constellation: Carina (Car) · Contains: NGC 3199

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NGC 3199: A WR Nebula

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NGC 3199: A WR Nebula

NGC 3199: A WR Nebula

OTA: PlaneWave 17” f/6.8
Camera.FLI ML16803
Observatory: Deep Sky West, Chile

EXPOSURES:
R: -- 8 x 600 seconds
G: -- 11 x 600
B: -- 10 x 600
H: -- 14 x 1800
S: -- 18 x 1800
O: -- 16 x 1800
Total exposure 28.7 hours

The published image is about 1/3 scale
Image Width: 40 arc-minutes
Processed by Alex Woronow (2022) using PixInsight, Topaz, 3DLut

The spherical nebula has been thrown off by the Wolf-Rayett star WR-18. It is colliding with a pre-existing cloud, probably at least in part an earlier, similar event. The cloud receives stimulation from the unusually hot and luminous WR-18.

Often imagers manage to capture only the bright arc of clouds and consequently call this the “Banana Nebula.” This image shows the fuller extent of the nebula, and the “banana” portion (at the right) is where the cloud is interacting most strongly with the pre-existing cloud, and perhaps it is piling up there. Toward the lower left, arcs of the cloud bulge farther away from the center point, where they likely have not encountered too much resistance.

This image uses isolated emission-line components from the SHO captures, discarding the continuum emissions. The luminance channel was assembled from the SHO lines plus a small contribution from the RGB. The resulting image, based on a true-color approximation from the SHO lines, was calibrated photometrically. The nebula was processed with the stars removed (via StarNet2), and the stars were copied back in toward the end of the processing. Copying the stars in does not cause the sometimes massive star color shift that arithmetically adding the back does.

Hope you enjoy this strange creature and all its details…
Alex Woronow

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Status	Advanced failed
Started	...
Astrometry.net job	6276920
PixInsight job	5VYL2IZDER825ZVR0I3XHE961L7Y3TDC
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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NGC 3199: A WR Nebula

NGC 3199: A WR Nebula

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NGC 3199: A WR Nebula

NGC 3199: A WR Nebula

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