The discovery of a large number of missing stars – not such a rare phenomenon that has long puzzled astronomers. New observations made with the space telescope Hubble, denied previous hypothesis apparent disappearance of a huge number of stars.
Often it turns out that some star clusters surrounding our Milky Way galaxy, contain fewer stars than they should, according to the observations. Astronomers suspect that many of these stars were driven from their clusters, and eventually found a new home in the Milky Way. But the new data telescope Hubble, directed his gaze to distant galaxies Fornax Cluster, showed that the hypothesis is most likely incorrect. The fact is that in the case of the Fornax Cluster thus thrown stars simply have nowhere to hide.
If these stars were exiled there somewhere, we would have seen them, but that did not happen – says study co-author Frank Grundal from the University of Aarhus in Denmark. – Disappeared from the cluster stars have been found in other globular Fornax Cluster.
Globular clusters are dense spherical clusters of stars that usually revolve around the galactic center like satellites, but far enough away from them. Such clusters are the ancient inhabitants of the universe and contain the oldest of the live stars.
Astronomers believe that the light in each of these groups was formed around the same time. However, observations of globular clusters near the Milky Way showed that about half of the stars of the old, the other half is much younger.
They also found that young stars have a high content of nitrogen and other elements present in the composition of the first generation of stars. It turns out that these clusters are formed in a different way: young stars appear to have formed from material ejected old stars and so older stars in the clusters were significantly more.
However, these theoretical conclusions are not consistent with observations showing that globular clusters contain an approximately equal number of old and young stars.
Lack of a population of stars of the first generation is not entirely inexplicable when it comes to the outskirts of the Milky Way. The galaxy itself has a high number of old stars, so the stars of the clusters could just go and settle on the outskirts of the galaxy, stir with its indigenous people. At least, that’s what scientists previously thought.
Furnaces clusters 1, 2, 3 and 5 are in the orbit of a dwarf galaxy Stoves, situated at a distance of 62 million light-years from Earth. The ratio of young and old stars in these clusters similarly closest to the Milky Way clusters other star clusters have different proportions of ages of light. Astronomers believe that the clusters were formed in a similar manner Ovens: younger stars were born out of the material of old stars, and many of the old stars have disappeared.
But if the stars were actually expelled, then where did they go? In contrast, the Milky Way, the galaxy of these clusters does not contain a sufficient number of old stars, in which the fugitives would be lost. Because of this, astronomers began to doubt the correctness of his hypothesis.
Four globular clusters in dwarf galaxies constellation Furnaces – in this region is not a huge population of stars.
Our main theory of the formation simply can not be true – complains Grundal. – Rejects the stars in the Fornax Cluster simply could not hide anywhere else – so it seems, the clusters could not be so huge in the past.
Now scientists are waiting for a difficult job: to completely rethink their hypotheses about the formation of globular clusters and stars Runaway.