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NGC 6193 (Open Cluster)


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NGC 6193
Open Cluster (散開星団)
OC II3p

別名 (Other names)
OCL 975, ESO 226-SC20, Caldwell 82, RCW 108, C 1637-486, Cl VDBH 195, Dun 413, Cr 310, Lund 716, h 3642, GC 4225

明るさ (Brightness)
5.2等級

星座 (Constellation)

さいだん座 (Ara) (Ara)

距離 (Distance)
4,000光年 (4,000 light-years)

NGC 6193 (Caldwell 82) is an open cluster located 4,000 light years from the Earth in the constellation Ara.

NGC 6193 (Open Cluster) : Picture

NGC 6193 (Open Cluster)
NGC 6193 (Open Cluster)
(C) Rbarba

NGC 6188
Shaping NGC 6188
(C) John Ebersole
NGC 6188 is an interstellar carnival of young blue stars, hot red gas, and cool dark dust. Located 4,000 light years away in the disk of our Galaxy, NGC 6188 is home to the Ara OB1 association, a group of bright young stars whose nucleus forms the open cluster NGC 6193. These stars are so bright that some of their blue light reflects off of interstellar dust forming the diffuse blue glow in the center of the above photograph. Open cluster NGC 6193 formed about three million years ago from the surrounding gas, and appears unusually rich in close binary stars. The red glow visible throughout the photograph arises from hydrogen gas heated by the bright stars in Ara OB1. The dark dust that blocks much of NGC 6188's light was likely formed in the outer atmospheres of cooler stars and in supernovae ejecta.

Star-forming Region RCW 108
Star-forming Region RCW 108
(C) ESO
RCW 108 is a molecular cloud that is in the process of being destroyed by intense ultraviolet radiation from heavy and hot stars in the nearby stellar cluster NGC 6193, seen to the left in the photo. A series of images were obtained with the Wide Field Imager (WFI) of areas in the Milky Way band, including some in which interstellar nebulae of gas and dust are seen. Each frame records 8184 x 8196, or over 67 million, pixels in a sky field of 32 x 32 arcmin 2. The photo shows the RCW 108 complex of bright and dark nebulae in the southern association Ara OB1, a star-forming region in the constellation Ara (the Altar), deep in the southern sky. The resolution in this image has been degraded by reducing the number of pixels in one direction from about 8000 to 3000 in the "High-Resolution version", in order to make the image transportable over the web without incurring completely unacceptable transfer times. Still, it is very large, even in the highly compressed jpeg format, reflecting the great amount of details visible.

RCW 108
RCW 108: Massive Young Stars Trigger Stellar Birth
(C) X-ray: NASA/CXC/CfA/S.Wolk et al; IR: NASA/JPL-Caltech
RCW 108 is a region where stars are actively forming within the Milky Way galaxy about 4,000 light years from Earth. This is a complicated region that contains young star clusters, including one that is deeply embedded in a cloud of molecular hydrogen. By using data from different telescopes, astronomers determined that star birth in this region is being triggered by the effect of nearby, massive young stars.

This image is a composite of X-ray data from Chandra (blue) and infrared emission detected by Spitzer (red and orange). More than 400 X-ray sources were identified in Chandra's observations of RCW 108. About 90% of these X-ray sources are thought to be part of the cluster and not stars that lie in the field-of-view either behind or in front of it. Many of the stars in RCW 108 are experiencing the violent flaring seen in other young star-forming regions such as the Orion Nebula. Gas and dust blocks much of the X-rays from the juvenile stars located in the center of the image, explaining the relative dearth of Chandra sources in this part of the image.

The Spitzer data show the location of the embedded star cluster, which appears as the bright knot of red and orange just to the left of the center of the image. Some stars from a larger cluster, known as NGC 6193, are also visible on the left side of the image. Astronomers think that the dense clouds within RCW 108 are in the process of being destroyed by intense radiation emanating from hot and massive stars in NGC 6193.

Taken together, the Chandra and Spitzer data indicate that there are more massive star candidates than expected in several areas of this image. This suggests that pockets within RCW 108 underwent localized episodes of star formation. Scientists predict that this type of star formation is triggered by the effects of radiation from bright, massive stars such as those in NGC 6193. This radiation may cause the interior of gas clouds in RCW 108 to be compressed, leading to gravitational collapse and the formation of new stars.

NGC 6193 (Open Cluster) NGC 6188
NGC 6193 (Open Cluster)
(C) Rbarba
NGC 6188
(C) John Ebersole
RCW 108 RCW 108
RCW 108
(C) ESO
RCW 108
(C) NASA
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NGC 6193 (Open Cluster) : Movie

RCW 108 in 60 Seconds
RCW 108 is a region where stars are actively forming about 4,000 light-years from Earth.
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