Distant from Earth 11 736 light years in the southern constellation of Carina, NGC 3199 is classed as a diffuse nebula, embedded with a highly assymetric Wolf-Rayet star close to the center of the ring. The nebula is about 75 light-years across.
A Wolf-Rayet star is hot, short-lived and generates an intense stellar wind. The one in NGC 3199, as mentioned, has a highly asymmetric morphology, with a very bright hemisphere near the exciting star HD 89358 and a much fainter and more extended other hemisphere.
This nebula is modeled in terms of the distorted bubble produced by a moving star blowing a strong stellar wind into a surrounding uniform interstellar medium.
This description is an outine of the article found in:
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1989A%26A...226..270D&defaultprint=YES&filetype=.pdfThe image is a LRGB standard enhanced by narrow band data from captures of 12 subframes of 20 minutes for each channel (Ha, O3 e S2).
The subs of LRGB followed the sequence showed below:
Lum: 10x900sec bin1x1
RGB: 10x600sec bin2x2
Set-up:
Scope: Esprit 120 f/7
Mount: CGE-Pro
Camera: ST8300M
OAG and Filter Wheel: SBIG 8300
Guider CCD: Lodestar
Darks, bias and Flats applied
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