Brown dwarf - Wikipedia, the free encyclopedia
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Brown dwarfs are sub-stellar objects with a mass below that necessary to maintain hydrogen-burning nuclear fusion reactions in their cores, as do stars on the main sequence, but which have fully conve...
en.wikipedia.org/wiki/Brown_dwarf
Relative sizes and effective surface temperatures of two recently discovered brown dwarfs -- Teide 1 and Gliese 229B -- compared to a yellow-dwarf star (our sun), a red dwarf (Gliese 229A) and the planet Jupiter reveal the transitional qualities of these objects.
astro.berkeley.edu/~stars/bdwarfs/ astro.berkeley.edu/~stars/bdwarfs/
Caption: Artist's Impression of the brown dwarf Gl 229B (with the low mass star Gl 229A) sitting about 40 AU away. This brown dwarf is a few billion years old, with a surface temperature of about 1000K. Its mass is in the 30-50 jupiter mass range (or 3-5% of our Sun).
astro.berkeley.edu/~basri/bdwarfs/index.html astro.berkeley.edu/~basri/bdwarfs/index.html
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The dimmest and least massive kind of star; the name "brown dwarf" was coined by Jill Tarter in the 1970s. A brown dwarf, which is not really brown but a...
www.daviddarling.info/encyclopedia/B/browndwarf.html www.daviddarling.info/encyclopedia/B/browndwarf.html
A substellar Jonah - the brown dwarf that was swallowed by a red giant and survived. An artists impression of the brown dwarf orbiting the white dwarf WD0137-349. The hot white dwarf is no bigger then the Earth, while the brown dwarf is about the size of Jupiter, although much more massive (55 times Jupiter's mass).
www.star.le.ac.uk/~mbu/browndwarf.html www.star.le.ac.uk/~mbu/browndwarf.html · Cached
Introduction and data on brown dwarf stars. The approximate size of a brown dwarf (center) compared to Jupiter left) and the Sun (right). Although brown dwarfs are similar in size to Jupiter, they are much more dense and produce their own light whereas Jupiter shines with reflected light from the Sun.
chandra.harvard.edu/xray_sources/browndwarf_fg.html chandra.harvard.edu/xray_sources/browndwarf_fg.html · Cached
"When we first studied the brown dwarf spectra, they were peculiar like no star we had ever seen before. The reason we saw missing light in the spectra of the coolest brown dwarfs is the presence of methane in the atmosphere, which we also see in the outer gas giants of the solar system: Jupiter, Saturn, Uranus, Neptune.
www.nasa.gov/vision/universe/starsgalaxies/brown_dwarf_... www.nasa.gov/vision/universe/starsgalaxies/brown_dwarf_detectives.html · Cached
Washington DC (SPX) Apr 14, 2008 - An international team of astronomers has discovered the coldest brown dwarf star ever observed. This finding, to be published in Astronomy and Astrophysics, The brown dwarf is named CFBDS J005910.83-011401.3 (it will be called CFBDS0059 in the following).
www.spacedaily.com/reports/The_Coldest_Brown_Dwarf_Ever... www.spacedaily.com/reports/The_Coldest_Brown_Dwarf_Ever_Observed_Closing_The_Gap_Between_Stars_And_Planets_999.html
Now astronomers have found the coldest brown dwarf to date. The cold brown dwarf floats freely in space, not bound to a star. Its mass is somewhere between 15 and 30 times that of Jupiter.
www.space.com/scienceastronomy/080410-cold-brown-dwarf.... www.space.com/scienceastronomy/080410-cold-brown-dwarf.html · Cached