red giant star


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red giant star

[′red ¦ji·ənt ′stär]
(astronomy)
A star whose evolution has progressed to the point where hydrogen core burning has been completed, the helium core has become denser and hotter than originally, and the envelope has expanded to perhaps 100 times its initial size.
References in periodicals archive ?
A "symbiotic X-ray binary" 6 a star system made up of a red giant star and a neutron star 6 is extremely rare.
In 2010, the satellite observed a white dwarf orbiting a red giant star, which blows gas into space.
Three planets were discovered, two orbiting stars similar to the Sun and one orbiting a more massive and evolved red giant star.
By gathering data about the nebula's age, mass and energy, the scientists learned much of the material surrounding the star "has been blasted out into space at speeds far beyond the capabilities of a single, red giant star," Raghvendra Sahai, a NASA astronomer and lead author, said in the NRAO statement.
Kawaler contributed as part of the research team that studied regular changes in the brightness of the host star, Kepler-56, an aging red giant star with two planets in close orbits and a massive third planet in a distant orbit.
The companion to the black hole in M83 is likely a red giant star at least 500 million years old, with a mass less than four times the sun's.
KELT-9 will swell to become a red giant star in about a billion years.
In a red giant star, a large convective envelope of plasma surrounds a radiative core where fusion happens.
Many stars are born in binary systems so an expanding red giant star will sometimes collide with an orbiting companion star.
Earth will face a similar challenge in about 5 billion years, when our sun swells to become a red giant star.
The sun is about half-way through its life in its current phase as a main sequence star, and about 5 billion years from now, it will expand into a red giant star.
The material in the outer halo of IC 1295 and similar planetaries is thought to consist of mass lost by an aging red giant star during an early phase of instability while the central region is the result of its last gasp.