RCW 19
Also called
Gum 10Coordinates: (253.8°, -0.5°)
[ Catalog | Explorer | SIMBAD ]
RCW 19 is part of a 200 thousand solar mass giant molecular cloud related to the Pup OB3 association and the O7f III giant star HD 69464. This image shows only the bright rim of the larger RCW 19 complex.
Avedisova adds the O9.5 III giant CD -35 4412 as a second ionising star. She places RCW 19 in the star formation region SFR 253.75-0.50 with the molecular cloud [MAB97] 253.63+0.00 (this may be the cloud mentioned above) and the reflection nebulae Bran 124b, Bran 125b and VdBH 9.
You can see RCW 19 and RCW 20 together in this SuperCOSMOS hydrogen-alpha image, which also shows the boundaries of Pup OB3 and the newly discovered Kharchenko cluster [KPR2005] 45 (labelled ASCC 1045).
Avedisova adds the O9.5 III giant CD -35 4412 as a second ionising star. She places RCW 19 in the star formation region SFR 253.75-0.50 with the molecular cloud [MAB97] 253.63+0.00 (this may be the cloud mentioned above) and the reflection nebulae Bran 124b, Bran 125b and VdBH 9.
You can see RCW 19 and RCW 20 together in this SuperCOSMOS hydrogen-alpha image, which also shows the boundaries of Pup OB3 and the newly discovered Kharchenko cluster [KPR2005] 45 (labelled ASCC 1045).
Neckel associates RCW 19 with RCW 20 and gives a joint distance of 3400 parsecs. Kharchenko places HD 69464 in the newly discovered ionising cluster [KPR2005] 45 along with the O-stars DM -35 4384 (O 9.5IV) and DM -35 4415 (O 7 N). (SIMBAD currently assigns B classes to these last two stars.) Humphreys places HD 69464 in the Pup OB3 association along with two other O9.5 IV class subgiants: CP -35 2105 = DM -35 4384 and CD -35 4471. SIMBAD agrees with the class for the second star (the first is one of the stars mentioned by Kharchenko).
RCW 19/20 have a joint distance of 3400 pc.[1]
Related to the O7f III giant star HD 69464.[2]
RCW 19 is part of a giant molecular cloud located at a distance of 3300 pc. It has 200 thousand solar masses and is related to the OB association Pup OB3.[3]
RCW 19/20 have a joint distance of 3400 pc.[1]
Related to the O7f III giant star HD 69464.[2]
RCW 19 is part of a giant molecular cloud located at a distance of 3300 pc. It has 200 thousand solar masses and is related to the OB association Pup OB3.[3]
Notes
1. ^ Neckel, Th. & Staude, H. J. (1995). "IRAS 08159-3543: Optical Detection of the Dusty, Neutral Bipolar Wind of a Luminous Young Stellar Object", The Astrophysical Journal, Vol. 448, 832. [1995ApJ...448..832N]
2. ^ Dubner, G., Giacani, E., Cappa de Nicolau, C., et al. (1992). "A study of the neutral hydrogen in direction to the GUM nebula", Astronomy and Astrophysics Supplement Series, Vol. 96, 505-523. [1992A&AS...96..505D]
3. ^ May, J., Murphy, D. C., & Thaddeus, P. (1988). "A wide latitude CO survey of the third galactic quadrant", Astronomy and Astrophysics Supplement Series, Vol. 73, 51-83. [1988A&AS...73...51M]
Distance estimates
3400 pc [1995ApJ...448..832N]3300 pc [1988A&AS...73...51M]
3080 pc +/- 250 [1984NInfo..56...59A]
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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.