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Wednesday, February 14, 2018

In the Solar vicinity there are still many undiscovered brown dwarfs


In the vicinity of the Sun can exist much more brown dwarfs than previously thought, scientists believe Gabriel Bihain and Ralf-Dieter Scholz from the Institute of astrophysics Potsdam Leibniz. The paper was published in the journal Astronomy & Astrophysics.

Scientists have carefully analyzed the distribution of close brown dwarfs in the Solar vicinity and found a significant asymmetry of their position in space. “The Northern part of the sky looks practical without brown dwarfs, although the theory of star formation predicts an even distribution across the celestial sphere,” say the astronomers.

The authors suggest that in the Solar vicinity there are many yet undiscovered brown dwarfs, and cosmic bodies of planetary mass. Previously it was assumed that four normal star forms a brown dwarf one. But, apparently, brown dwarfs should occur more often — say scientists.

Brown dwarfs — it substania objects with masses from 12 to 80 Jupiter masses, which in some time may develop a thermonuclear reaction of fusion of the nuclei of light elements such as deuterium, lithium, beryllium and boron. But, unlike normal stars, the temperature in the depths of a brown dwarf is not enough that they began full-fledged fusion reaction of hydrogen nuclei.

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