Gum 28
Also called
RCW 48Coordinates: (283.5°, -1.0°)
[ Catalog | Explorer | SIMBAD ]
Also called NGC 3199, RCW 48 is a ring nebula surrounding the Wolf Rayet star WR 18. Avedisova says that the nebula is also ionised by the B0.5 V star CP -57 2909. She places RCW 48 in star formation region SFR 283.55-0.98, along with the emission star CD-57 3107, the dark cloud FeSt 2-80 and the nebulae Bran 300B and Bran 300C.
There seems to be confusion about the identification of Bran 300B and Bran 300C. SIMBAD identifies Bran 300B with the star cluster NGC 3247, which Avedisova places in a separate star formation region with RCW 49. SIMBAD identifies Bran 300C with RCW 50, which Avedisova places in a third star formation region separate from either RCW 48 or RCW 49.
You can see a good image of NGC 3199 on the Astronomy Picture of the day website.
There seems to be confusion about the identification of Bran 300B and Bran 300C. SIMBAD identifies Bran 300B with the star cluster NGC 3247, which Avedisova places in a separate star formation region with RCW 49. SIMBAD identifies Bran 300C with RCW 50, which Avedisova places in a third star formation region separate from either RCW 48 or RCW 49.
You can see a good image of NGC 3199 on the Astronomy Picture of the day website.
According to a 1989 paper, the exciting star is moving at a rate of 60 km/s into the gas that makes up the nebula, like an interstellar snow plough.[1] However, a 2001 paper based on Hipparcos measurments show that the star is actually moving in quite a different direction and hence could not be causing a bow shock. [2]
Also called NGC 3199, this is a ring nebula around the Wolf Rayet star WR 18, which lies at a distance of 2200 pc.[2]
Also called NGC 3199, this is a ring nebula around the Wolf Rayet star WR 18, which lies at a distance of 2200 pc.[2]
Notes
1. ^ Dyson, J. E. & Ghanbari, J. (1989). "The Wolf-Rayet nebula NGC 3199 - an interstellar snow plough?", Astronomy and Astrophysics, Vol. 226, 270-277. [1989A&A...226..270D]
2. ^ Marston, A. P. (2001). "First Detections of Molecular Gas Associated with the Wolf-Rayet Ring Nebula NGC 3199", The Astrophysical Journal, Vol. 563, 875-882. [2001ApJ...563..875M]
3. ^ Marston, A. P. (2001). "First Detections of Molecular Gas Associated with the Wolf-Rayet Ring Nebula NGC 3199", The Astrophysical Journal, Vol. 563, 875-882. [2001ApJ...563..875M]
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Most of the sources used to create these nebula descriptions are listed in the
notes section for each description. In some cases,
for example the Avedisova, Humphreys and Reed catalogs, the source is used extensively and is not listed in the
individual nebula descriptions. See this catalog overview
for more information on the catalogs and the general sources used
to create these descriptions and this introduction to HII regions
on the general history of this area of astronomy.
This image was created using the POSS-II/UKSTU data of the Digitized Sky Survey and SuperCOSMOS using the process described here.
According to my correspondence with the Royal Observatory Edinburgh and the Space Telescope Science Institute, I am allowed to use the POSS-II/UKSTU data to create and display images for non-commercial purposes so long as I include this fine print for the SuperCOSMOS data:
Use of these images is courtesy of the UK Schmidt Telescope (copyright in which is owned by the Particle Physics and Astronomy Research Council of the UK and the Anglo-Australian Telescope Board) and the Southern Sky Survey as created by the SuperCOSMOS measuring machine and are reproduced here with permission from the Royal Observatory Edinburgh.
and this acknowledgement taken from the DSS site:
The Digitized Sky Surveys were produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions.
The Second Palomar Observatory Sky Survey (POSS-II) was made by the California Institute of Technology with funds from the National Science Foundation, the National Geographic Society, the Sloan Foundation, the Samuel Oschin Foundation, and the Eastman Kodak Corporation.
The UK Schmidt Telescope was operated by the Royal Observatory Edinburgh, with funding from the UK Science and Engineering Research Council (later the UK Particle Physics and Astronomy Research Council), until 1988 June, and thereafter by the Anglo-Australian Observatory. The blue plates of the southern Sky Atlas and its Equatorial Extension (together known as the SERC-J), as well as the Equatorial Red (ER), and the Second Epoch [red] Survey (SES) were all taken with the UK Schmidt.
The "Second Epoch Survey" of the southern sky was made by the Anglo-Australian Observatory (AAO) with the UK Schmidt Telescope. Plates from this survey have been digitized and compressed by the ST ScI. The digitized images are copyright ? 1993-5 by the Anglo-Australian Observatory Board, and are distributed herein by agreement.
The "Equatorial Red Atlas" of the southern sky was made with the UK Schmidt Telescope. Plates from this survey have been digitized and compressed by the ST ScI. The digitized images are copyright ? 1992-5, jointly by the UK SERC/PPARC (Particle Physics and Astronomy Research Council, formerly Science and Engineering Research Council) and the Anglo-Australian Telescope Board, and are distributed herein by agreement.
The compressed files of the "Palomar Observatory - Space Telescope Science Institute Digital Sky Survey" of the northern sky, based on scans of the Second Palomar Sky Survey are copyright ? 1993-1995 by the California Institute of Technology and are distributed herein by agreement. The compressed files of the "Palomar Observatory - Space Telescope Science Institute Digital Sky Survey" of the northern sky, based on scans of the Second Palomar Sky Survey are copyright ? 1993-1995 by the California Institute of Technology and are distributed herein by agreement.