Wikipedia This ancient stellar jewel box, a globular cluster called NGC 6397, glitters in the light of hundreds of thousands of stars. Wikipedia This ancient stellar jewel box, a globular cluster called NGC 6397, glitters in the light of hundreds of thousands of stars. ngc 6397 is a globular cluster in the constellation Ara. NGC 6397 is a globular cluster in the constellation Ara.
It is on the list of the Southern Sky Binocular Club of the Astronomical League. It is located about 7,800 light years from Earth, making it one of the two closest globular clusters to Earth. Caldwell 86 in Patrick Moore’s list. The cluster contains about 400,000 stars and can be seen with the naked eye.
How old is NGC 6397?
This means that NGC 6397 and its home galaxy, the Milky Way, were formed when the universe was just about 400 million years old. Globular clustersBullet clusters are very tightly bound together by gravity, which gives them their spherical shape and the high concentration of stars at their centre. The chosen mass range in the prime sequence of the null age is the one needed to produce white dwarfs with a mass suitable for NGC 6397, which means that NGC 6397 and its home galaxy, the Milky Way, were formed when the universe was just 400 million years old. They found that for the observed shape of the luminosity function of the white dwarf of NGC 6397, either a low oxygen mass fraction in the inner carbon-oxygen core of typical white dwarfs was required, or the crystallisation temperature of the dense binary carbon-oxygen plasma had to be significantly higher than that of a single-component plasma.
Is NGC 6397 located in the Milky Way?
This means that NGC 6397 and its home galaxy, the Milky Way, were formed when the universe was only about 400 million years old. Unfortunately, the partitioning of the stars into different chemical populations in NGC 6397 was only done with HST data, which is limited to small projected radii. Dividing the stars of NGC 6397 into chemical populations is possible, but beyond the scope of this article. The centre of the globular cluster NGC 6397 is a spectacular collection of hundreds of thousands of stars.
From this we conclude that the visible stars in NGC 6397 have quasi-isotropic orbits, at least for those stars brighter than F606W = 19.76 and up to R = 8′.
Did Hubble discover the black holes?
Hubble, born in 1889, discovered that many objects previously thought to be clouds of dust and gas and classified as nebulae were actually galaxies beyond the Milky Way. Astronomers have seen many examples of small black holes the size of a star and other examples of much larger black holes, usually located at the centres of galaxies. The Hubble Space Telescope is on the trail of a suspected black hole that shredded a careless star that got too close to it. Postman’s team has published a detailed analysis of how the merger of two supermassive black holes could reshape the galaxy into what the astronomers found.
Which globular cluster is closest to us?
The three basic types of star clusters that astronomers have discovered are globular clusters, open clusters and stellar associations. This is certainly true of the Hyades star cluster, which is closest to Earth at a distance of only 153 light years. The density near the centres of globular clusters is about two stars per cubic light-year, compared to one star per 300 cubic light-years in the solar neighborhood. The abundance of metals is higher in clusters near the Galactic centre than in those in the halo (the outermost region of the Galaxy that extends far above and below its plane).
Globular cluster, a large group of old stars that lie close together in a symmetrical, somewhat spherical shape.
