| When its fuel runs out, an old star expands into a red giant and then collapses to become a white dwarf. |
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| The usual model for these events is that a white dwarf star is gaining mass by accretion from a companion. |
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| Sifting through these observations, they were able to detect the white dwarf orbiting the pulsar and measure its color and temperature. |
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| The collapsed core will become a white dwarf, composed of degenerate matter supported by the inability of two electrons to occupy the same space. |
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| But quantum theory said that there is a way to make a star denser than a white dwarf. |
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| The planet, more than twice the size of Jupiter, orbits two stars, a pulsar and a white dwarf that linked together about a billion years ago. |
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| The companion star of this system is a white dwarf roughly the size of the earth. |
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| If the clump is really there, it may come from nuclear burning inside the exploding white dwarf, or it may come from the companion star. |
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| Several of the stellar class of white dwarf stars, which have low luminosities and high densities, also are among the brightest stars. |
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| The team has identified eight carbon-dominated atmosphere white dwarf stars among about 200 DQ stars checked in the Sloan data so far. |
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| It has sneezed off its outer layers, leaving its core as a white dwarf star, about the size of the Earth, very slowly cooling off. |
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| From more than a century of research into how stars work we know what temperature a white dwarf star is when it forms. |
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| This remnant is called a white dwarf star, and is about the size of the Earth, but is much more massive. |
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| The only reasonable answer, they concluded, was that the invisible object is a white dwarf star. |
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| The composition of the stars does not fit into any currently known class of white dwarf stars, so their evolution remains a mystery. |
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| These explosions are called novae, and the white dwarf star will brighten significantly as seen from the Earth. |
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| Rich in objects, from galaxies to quasars to white dwarf stars, this vast data archive will serve as a resource for the entire astronomical community. |
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| However, the temperature and pressure imply that the white dwarf is more like a diamond than anything else. |
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| In the case of the 1572 explosion, when the white dwarf exploded, the companion star was released from its gravitational influence like a stone being thrown by a sling. |
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| His work eventually led to the theory explaining the highly dense white dwarf stars. |
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| A white dwarf is the stellar equivalent of a shrunken but feisty old-age pensioner. |
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| Among all the binary stars comprising a white dwarf, Sirius is a singular system. |
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| If we measure its temperature now, we can calculate how long ago the white dwarf formed by determining how much it has cooled. |
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| A team of astronomers, including a researcher from Paris Observatory, have discovered white dwarf stars with nearly pure carbon atmospheres. |
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| January 31, 1862, the white dwarf Sirius-B, was discovered around the Sirius star, using the first large modern telescope. |
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| Such a star is very suitably called a white dwarf and is the end of a normal sunlike star's life. |
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| While outer layers are blown away, the resulting collapsed core will result in either of a white dwarf, a neutron star, or a black hole, depending on its final mass. |
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| The first white dwarf to be recognized was the companion to Sirius. |
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| Novae are interacting binary stars where a cool secondary star loses mass to a white dwarf primary. |
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| That absorption spectrum allows the scientists to probe the value of alpha in the atmosphere of the white dwarf with high accuracy. |
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| Astronomers have identified more than 30 of these mini-supernovas that may leave behind a surviving white dwarf. |
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| The fusion reaction pumping out heat and energy end the life span of a star, hence making it a white dwarf star as it is faint, dense and cold. |
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| Where the accretor is always a white dwarf, the donor star can be either a white dwarf, a low-mass helium star or an evolved main-sequence star. |
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| The thermonuclear explosion of a white dwarf star produces such supernovas. |
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| Later still, it will eject part of its material back into space. The remainder will collapse into a tiny white dwarf star, half the Sun's mass and about the size of Earth. |
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| In particular, a phenomenon known as a white dwarf hypernova could have sucked alien life into a black hole. |
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| The Sun is destined to perish as a white dwarf. |
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| But a white dwarf cannot explode by itself. |
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| The white dwarf domain lies about 10 magnitudes below the main sequence. |
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| Figure 2: Fit to the optical spectra for a carbon-rich white dwarf. |
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| Later, the white dwarf blows off a faster wind of particles moving mostly outward along the poles of the orbital plane. |
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| It consists of a white dwarf star in close orbit with a much larger red giant star. |
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| Gradual mass change occurs when a star becomes a giant star and ejects a planetary nebula, leaving behind a lower mass white dwarf. |
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| Novae are thought to occur when a white dwarf star in a binary system explodes. |
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| They have investigated 500 white dwarf stars and it's the only one like it they've found. |
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| Ordinarily, these elements would sink into the star quickly and disappear, so the atoms are probably raining down on the white dwarf as the planets break apart. |
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| Closely orbiting binary stars can follow more complex evolutionary paths, such as mass transfer onto a white dwarf companion that can potentially cause a supernova. |
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| Symbiotic stars are widely separated, long orbital period interacting binary stars consisting of a late-type giant star and a hot compact companion, usually a white dwarf. |
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| The scientists used an effect of Albert Einstein's theory of General Relativity to measure the mass of the neutron star and its orbiting companion, a white dwarf star. |
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| It follows a spate of animal dumping over Christmas that has resulted in the death of a white dwarf buck rabbit, deserted in a cage in Mile Lane, Cheylesmore. |
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| White dwarf stars, the compact remnants left behind when stars like the Sun reach the end of their lives are an ideal natural laboratory to test this idea. |
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