New data on brown dwarfs

Получены новые данные о коричневых карликах

The team carried out calculations using data from two long-term projects.

Serge Dietrich of Carnegie Institute along with his team conducted a study published in the Astrophysical journal. In their work, scientists have demonstrated that brown dwarfs may be more massive than anticipated.

For the bright glow of the stars requires energy, obtained in the process of thermonuclear reactions in its interior. If hydrogen is too low, the reaction is impossible, and then the object cools, darkens and turns into something known as a brown dwarf. Astronomers around the world are trying to determine the mass, temperature and brightness of objects both sides from the line drawn between “star losers” and ordinary stars.

“The definition of the boundary that separates stars from brown dwarfs will help to learn more about how these are formed and develop, and clarify, can around them (brown dwarfs. – Approx. ed.) rotate habitable planets,” explains Dietrich.

Recent theoretical models predict that the boundary between stars and brown dwarfs lies in the range from 70 to 73 Jupiter masses, or about 7% of the mass of the Sun. However, the results obtained by the team of Dietrich, questioned those calculations.

The researchers observed two brown dwarf – an Indian Epsilon b and Epsilon c Indian. They belong to the system, which also includes the star’s average luminosity – Epsilon Indian. Two brown dwarf too dim to be stars, but their masses are 75 and 70 Jupiter masses, respectively.

The team carried out calculations using data from two long-term projects – Carnegie Astrometric Planet Search in the Observatory of Las Campanas and Cerro Tololo Inter-American Observatory Parallax Investigation under the guidance of the Consortium for the study of the nearest stars. This allowed us to determine minute movements of the two brown dwarfs against the background of more distant stars.

To the surprise of scientists, the results identified the Indian Epsilon b and Epsilon c Indian like stars (old definition), despite the fact that according to the observations of stars they are not.

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