Gum 56
Also called
RCW 116Coordinates: (345.0°, 1.7°)
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This is IC 4628, the Prawn nebula, which is a dense concentration of gas and dust ionised by the star cluster Trumpler 24. It lies within the more diffuse nebula RCW 113 surrounding the Sco OB1 association.
Avedisova says that the Prawn nebula is ionised by two O-class giants: HD 332417 (O6 III) and HD 152723 (O6.5 III). She places it in star formation region SFR 344.22+1.70 with 59 components, including 19 infrared sources, 8 masers, the emission star MCW 1264 and Trumpler 24. (Avedisova misspells the name of the emission star as MWC 1264, but this is clearly an error. The HD catalog gives a completely different location and spectral class for HD 332417 so it appears that Avedisova is mistaken in this case.)
Reed lists the O5 III giant LS 3873=HD 322417, the O6 III giant LS 3868, the O8 star LS 3843, the O9 star LS 3840 and the O9.5 IV subgiant LS 3874 in this direction as well. Given the similarity in names, it seems possible that Avedisova's HD 332417 reference was meant to be HD 322417.
The nebula contains the infrared clusters [DBS2003] 113 and [DBS2003] 114, as well as the infrared group [DBS2003] 117.
This is a black and white hydrogen-alpha image of the Prawn nebula - much more colourful images are widely available on the Internet. You can also see several knots of young star development in this MSX infrared image.
Given the high concentration of O-stars in this direction and the prominence of the Prawn nebula at infrared and radio frequencies, it is surprising that this region has received so little study to date in the scientific literature.
Avedisova says that the Prawn nebula is ionised by two O-class giants: HD 332417 (O6 III) and HD 152723 (O6.5 III). She places it in star formation region SFR 344.22+1.70 with 59 components, including 19 infrared sources, 8 masers, the emission star MCW 1264 and Trumpler 24. (Avedisova misspells the name of the emission star as MWC 1264, but this is clearly an error. The HD catalog gives a completely different location and spectral class for HD 332417 so it appears that Avedisova is mistaken in this case.)
Reed lists the O5 III giant LS 3873=HD 322417, the O6 III giant LS 3868, the O8 star LS 3843, the O9 star LS 3840 and the O9.5 IV subgiant LS 3874 in this direction as well. Given the similarity in names, it seems possible that Avedisova's HD 332417 reference was meant to be HD 322417.
The nebula contains the infrared clusters [DBS2003] 113 and [DBS2003] 114, as well as the infrared group [DBS2003] 117.
This is a black and white hydrogen-alpha image of the Prawn nebula - much more colourful images are widely available on the Internet. You can also see several knots of young star development in this MSX infrared image.
Given the high concentration of O-stars in this direction and the prominence of the Prawn nebula at infrared and radio frequencies, it is surprising that this region has received so little study to date in the scientific literature.
Dutra cluster catalog. [1]
Notes
1. ^ Dutra, C. M., Bica, E., Soares, J., et al. (2003). "New infrared star clusters in the southern Milky Way with 2MASS", Astronomy and Astrophysics, Vol. 400, 533-539. [2003A&A...400..533D]
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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.