NGC 3247 and NGC 3199 in Carina (two frame mosaic)

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NGC 3247 and NGC 3199 can be imaged in one field of view with a wide angle imaging setup or one can produce mosaic from two or more frames.

NGC 3247 - This giant HII region and massive star formation region in the Carina arc is associated with the star cluster Westerlund 2. There are two Wolf Rayet stars (WR 20a and WR 20b) as well as at least a dozen O-stars within this massive cluster. The hottest known O-star is the O3V. A 2007 study gives a distance estimate of 26 000 ly +/- 4 500 ly.

NGC 3199 - Hanging out some 11 736 light years away in the southern constellation of Carina, NGC 3199 is classed as a diffuse nebula embedded with a Wolf-Rayet star. Near the center of the ring is a Wolf-Rayet star, a massive, hot, short-lived star that generates an intense stellar wind. The nebula is about 75 light-years across. The Wolf-Rayet nebula NGC 3199 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 model is fitted to the morphology and observed kinematic data. The exciting star appears to be moving at about 60 km/s into local interstellar gas of density of about 10/cu cm, and has a mass-loss rate of about 0.000027 solar mass/yr. This latter mass-loss rate is in excellent agreement with observed mass-loss rates from Wolf-Rayet stars.

Brief adapted information: The Wolf-Rayet nebula NGC 3199 - an interstellar snow plough? (Dyson, J. E.; Ghanbari, J.)

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