failed star


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failed star:

see brown dwarfbrown dwarf,
in astronomy, celestial body that is larger than a planet but does not have sufficient mass to convert hydrogen into helium via nuclear fusion as stars do. Also called "failed stars," brown dwarfs form in the same way as true stars (by the contraction of a swirling
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.

failed star

[¦fāld ′stär]
(astronomy)
References in periodicals archive ?
A brown dwarf, or "failed star", is an object more massive than a planet yet too small to trigger the thermonuclear reactions that power stars.
The body, about eight times as heavy as Jupiter, resides next to a failed star, a brown dwarf dubbed 2M1207 (SN: 5/7/05, p.
But the mass that a brown dwarf accumulates is not enough to ignite thermonuclear reactions in its core, resulting in a failed star that is very cool.
To a layman like me, it seems almost impossible that light reflected from a body that lies "much farther from the star than Pluto does from the sun" could be seen from Earth at a distance of 450 light years, when Pluto, only 6 light hours away, reflects so little light to Earth ("Stellar Question: Extrasolar planet or failed star?" SN: 4/9/05, p.
In the case of 2M1207b, the exoplanet has a mass four times that of Jupiter. The planet orbits 2M1207, a (http://www.space.com/25659-coldest-brown-dwarf-near-sun-discovery.html) brown dwarf - a failed star that's too large to be a planet, but lacks the mass necessary to start nuclear fusion in its core - located five billion miles away.
Barely more massive than a planet itself, a failed star 500 light-years from Earth is nevertheless cloaked in a disk of gas and dust from which planets could coalesce.
Upon his success, McNeil reflected: "I find it simply stunning that a $1,000 scope, which I literally pieced together on my kitchen table, was able to detect a 21st-magnitude object whose identity as a failed star was announced only days before I arrived at TSP."
Kevin Luhman, Penn State's Associate Professor of Astronomy and Astrophysics classifies this object as a "brown dwarf" - an object that formed just like a star out of a massive cloud of duct and gas, but the mass that it accumulates is not enough to ignite thermonuclear reactions in its core, resulting in a failed star that is very cool.
According to International Astronomical Union standards, the heavier body is a failed star known as a brown dwarf.
At both Keck II and Gemini North, Liu and his colleagues took images of a failed star, or brown dwarf, orbiting a young, sun-like star at a distance that could be just slightly greater than that at which Saturn orbits our sun.
Washington, July 30 (ANI): Astronomers have discovered a very young brown dwarf (or failed star dubbed "PZ Tel B") in a tight orbit around a young nearby Sun-like star (PZ Tel A).
The object, known as GJ 758 B, could be either a large planet or a "failed star," also known as a brown dwarf.