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NGC 3572 (Open Cluster)


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NGC 3572
Open Cluster (散開星団)
OC I2m

別名 (Other names)
OCL 846, ESO 129-SC1

明るさ (Brightness)
6.6等級

星座 (Constellation)
りゅうこつ座 (Car) (Carina)


距離 (Distance)
6,500光年 (6,500 light-years)

NGC 3572 is an open cluster located 6,500 light years from the Earth in the constellation Carina.

NGC 3572 (Open Cluster) : Picture

NGC 3572 (Open Cluster)
NGC 3572 (Open Cluster)
(C) ESO
Astronomers at ESO have captured the best image so far of the curious clouds around the star cluster NGC 3572. This new image shows how these clouds of gas and dust have been sculpted into whimsical bubbles, arcs and the odd features known as elephant trunks by the stellar winds flowing from this gathering of hot young stars. The brightest of these cluster stars are much heavier than the Sun and will end their short lives as supernova explosions.

Most stars do not form alone, but with many siblings that are created at about the same time from a single cloud of gas and dust. NGC 3572, in the southern constellation of Carina, is one of these clusters. It contains many hot young blue-white stars that shine brightly and generate powerful stellar winds that tend to gradually disperse the remaining gas and dust from their surroundings. The glowing gas clouds and accompanying cluster of stars are the subjects of a new picture from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile.

In the lower part of the image a big chunk of the molecular cloud that gave birth to these stellar youngsters still can be seen. It has been dramatically affected by the powerful radiation coming from its smoldering offspring. The radiation not only makes it glow with a characteristic hue, but also sculpts the clouds into amazingly convoluted shapes, including bubbles, arcs and the dark columns that astronomers call elephant trunks.

A strange feature captured in this image is the tiny ring-like nebula located slightly above the centre of the image. Astronomers still are a little uncertain about the origin of this curious feature. It is probably a dense leftover from the molecular cloud that formed the cluster, perhaps a bubble created around a very bright hot star. But some authors have considered that it may be some kind of oddly shaped planetary nebula — the remnants of a dying star.

Stars born inside a cluster may be siblings, but they are not twins. They have almost the same age, but differ in size, mass, temperature, and colour. The course of a star's life is determined largely by its mass, so a given cluster will contain stars in various stages of their lives, giving astronomers a perfect laboratory in which they can study how stars evolve.

These gangs of young stars stick together for a relatively short time, typically tens or hundreds of millions of years. They are gradually disbanded by gravitational interactions, but also because the most massive stars are short-lived, burning through their fuel quickly and ultimately ending their lives in violent supernova explosions, thus contributing to the dispersion of the remaining gas and stars in the cluster.

NGC 3572 (Open Cluster)
NGC 3572 (Open Cluster)
(C) ESO
This wide-field image shows the patch of sky around the star cluster NGC 3572 and its associated gas clouds. This view was created from photographs forming part of the Digitized Sky Survey 2. The spikes and blue circles around the stars in this picture are artifacts of the telescope and the photographic process.

NGC 3572 (Open Cluster)
NGC 3572 (Open Cluster)
(C) ESO
This chart shows the location of the star cluster NGC 3572 in the constellation of Carina. This map shows most of the stars visible to the unaided eye under good conditions, and the location of the cluster and its associated glowing gas clouds is highlighted with a red circle on the image. The cluster is easily seen in a small telescope, but the gas clouds are much more elusive.

NGC 3572 (Open Cluster) NGC 3572 (Open Cluster)
NGC 3572 (Open Cluster)
(C) ESO
NGC 3572 (Open Cluster)
(C) ESO
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NGC 3572 (Open Cluster) : Movie

Zooming in on the star cluster NGC 3572 A close look at the star cluster NGC 3572 and its dramatic surroundings
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