Discovered the coldest star - not a hot cup of coffee


30/03/2011

Astronomers generally classified stellar objects ranging from the hotter to the cooler using the letters O, B, A, F, G, K and M. With the development of monitoring tools, it made a lot of new astronomical discoveries. Only in the last 15 years have been added two new classes - L and T, to describe a very cold brown dwarfs. This scientific discovery to its description may require the addition of another class that would describe the coldest star ever discovered.

The brown dwarf, called CFBDSIR 1458 10b, has a remarkably low surface temperature - 97 degrees Celsius - not hot morning cup of freshly made coffee.

"During the past years, there was a slow but steady progress in finding more and more cool stars," - said study leader Michael Liu, an astronomer at the University of Hawaii, where a group of researchers studied and published a scientific paper on CFBDSIR 1458 10b.

CFBDSIR J1458 +1013 B has never been so hot as our Sun, "because it has evolved from a relatively small gas cloud," - said Duane Pontius, a physics professor from Alabama. "Gravity is forced cloud come together and squeezed gas that is hot, just as the heated pump when you pumping a tire. But unlike the brighter stars, gas is not enough for it to heat up to the point of a star."

This means that due to the comparatively small mass and gravitational energy, can not maintain dwarf hydrogen thermonuclear reaction in the nucleus which is required for heating the surface of up to 5500 degrees Celsius as our Sun (quite low temperatures, compared to other stellar bodies).

"The new facility is so cold all the rest, which may well enjoy the atmosphere with water clouds," - said Liu.

Original: Zmescience


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