Brown stars don't go with normal stars

Brown stars, objects smaller than stars but larger than planets, are becoming more and more confusing, according to the study of 233 star systems of NASA's non-gros Hubble Telescope. Hubble only found 2 brown stars near the normal stars. This means that the 'brown star desert' phenomenon (the absence of brown stars around stars like the Sun) extends to the smallest stars in the universe.

Sergio Dieterich of Georgian State University in Atlanta and research director reported the results of the study at the 213th session of the American Astronomical Society (ASS) in Long Beach, Calif., January 6 .

Dieterich said: 'We have not found brown stars around small red stars whose mass is only slightly lower than the limit of hyrdo, especially, when we consider the existence of double brown star systems, then The fact that the binary star system, which is located on either side of the hydrogen burning limit, is a remarkable thing '.

233 stars surveyed are part of the RECONS survey to understand the nature of stars near the Sun. The original goals were to discover and describe 'absent' members of the stars since in 32.6 light years on Earth (10 pacsec).

Double brown star Kelu-1. Two photographs of the Hubble Space Telescope capturing a double brown star Kelu-1 tracks the orbital motions of two stars for 7 years, due to the Near-Infrared Camera and the Multi-Object Spectrometer (NICMOS) Hubble perform. In 1998, these two stars were too close to each other, making Hubble indistinguishable. By 2005, they had moved away from each other at a distance of 520 million miles. The maximum distance is predicted to be 550 million miles. The binary star system allows astronomers to determine the mass of the accompanying objects. The brown star pair has a mass of 61 and 50 times Jupiter. So they are too small to burn like normal stars, but too big to become planets. Based on the total mass of this star system, astronomers have identified that a third brown star has not yet been identified. (Photo: NASA, ESA, and M. Stumpf (Max Planck Astronomy Academy)).

RECONS searched for stars near the sun by analyzing all available sky surveys, combined with observations with a variety of telescopes at both hemispheres.A total of 12 brown stars are known in 32.6 light years on Earth, while the number of red stars is 239 (stars with masses of 20% of the Sun, and the diameter and temperature are equal to half of the Sun).

In fact, the number of brown stars is known to be roughly equal to the number of extrasolar planets. However, the number of extrasolar planets in this region has so far been very limited, because small-mass planets are not within our current detection capabilities.

The Hubble survey, conducted by Near-Infrared Camera and Multi-Object Spectrometer on Hubble, provides statistics that show the fact that brown stars do not exist around ordinary stars, including stars. has the smallest weight. Dieterich said: 'If the mass ratio is the deciding factor, we might have expected to find nau stars around smaller red stars than stars like the Sun.'

These results are also consistent with another study reported at the AAS meeting of Micaela Stumpf of Max Planck Astronomy Academy in Heidelberg, Germany. These results show that brown stars tend to go together.

The observation for nearly 10 years of NICMOS combined with the recent optical results observed from the ground provided the first assessment of the trajectory of a double brown star system Kelu-1 AB. Their trajectories are off-center and last for 38 years.

Based on the orbital dynamics, the total mass of this system is estimated at 184 times the mass of Jupiter. However, based on photometric and spectrophotometric measurements, two brown stars only have masses equal to 61 and 50 times Jupiter (a normal star has a minimum mass of 75 times Jupiter).Stumpf reports that there may in fact be a third member in this stellar system that accounts for the 'missing' volume. This may lead to the first three-star system.

All-sky surveys are planned for the next decade with advanced telescopes like the entire Telescope, promising to explain the 'brown star desert' phenomenon using pink rays. deep outside to find hidden brown star systems.