White Dwarf

White Dwarf
Related Category: Astronomy: General
in astronomy, a type of star that is abnormally faint for its white-hot temperature (see mass-luminosity relation).

White Dwarfs
A white dwarf surrounded by a cocoon of gas
Click on image for full size
NASA, STScI ...

White dwarfs within 10 parsecs
H. Bond (STSci), R. Ciardullo (PSU), WFPC2, HST, NASA
White dwarfs are remnant stellar cores that have cast off their outer gas layers, like planetary nebula
NGC 2440.

White Dwarf
Sirius B was the first white dwarf discovered in 1862. The bright source in this Chandra image is Sirius B shining in low-energy X-rays at ~25,000 Kelvin.

White dwarf
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History
White dwarf A white dwarf is a star formed when a red giant runs out of helium fuel after losing most of its mass into space.

White dwarfs
Stellar stability and evolution
Main sequence stars, like the Sun, represent a balance between the force of gravity, which is trying to compress the star, and radiation pressure, which is trying to make the star expand.

white dwarf
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White dwarf's slow spin
not just skin-deep
DR EMILY BALDWIN
ASTRONOMY NOW
Posted: September 24, 2009 ...

White Dwarfs
Introduction to White Dwarfs
Where a star ends up at the end of its life depends on the mass, or amount of matter, it was born with. Stars that have a lot of mass may end their lives as black holes or neutron stars.

White dwarfs are the final stage of low-mass stellar evolution.
Low-mass stars, those of roughly 1 to 4 solar masses, undergo a series of evolutionary steps.

Definition: white dwarf: A star that has exhausted most or all of its nuclear fuel and has collapsed to a very small size. Typically, a white dwarf has a radius equal to about 0.

White dwarf
Wikipedia, the free encyclopedia - Cite This Source
A white dwarf, also called a degenerate dwarf, is a small star composed mostly of electron-degenerate matter.

White Dwarfs
Mainly when a star is frmed, its mass determins its end. Either it will become a black hole, neutron star, or white dwarf. If there is alot of mass then it will end its life by either becoming a black hole or neutron star.

- White Dwarf Linux - What is White Dwarf Linux
- Supernova (plural: supernovae) - Space and Astronomy Definition - Online Dictionary and Glossary Definition of Supernova (plural: supernovae) ...

Timeline of white dwarfs, neutron stars, and supernovae
Timeline of white dwarfs, neutron stars, and supernovae ...

WHITE DWARF - Remnant of a star with mass <8 Msun. White dwarfs have masses <1.4 Msun (the Chandrasekhar mass) and are supported by electron degeneracy pressure. White dwarfs have radii ~Rearth (<0.02 Rsun) and densities ~105-6 g/cm3.

white dwarf A dwarf star with a surface temperature that is hot, so that the object glows white.
white dwarf region The bottom left-hand corner of the Hertzsprung-Russell diagram, where white dwarf stars are found.

White Dwarfs
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white dwarf
the dense, collapsed, Earth-sized remnant of an intermediate-mass star like the Sun
winter ...

White Dwarfs
The exposed, remnant core that ionised the planetary nebula material is basically an extremely hot, dense sphere of carbon and oxygen. Any hydrogen not ejected quickly fuses via shell-burning.

White dwarf star: a small star, about the size of Earth; one of the last stages of a star's life ...

White Dwarf
A black dwarf constitutes the remains of a Sun-sized star which has evolved to a white dwarf, also called a degenerate dwarf, is a small star composed mostly of electron-degenerate matter.

White Dwarf: The collapsed remnant of a relatively low-mass star (roughly 1 1/2 times the Sun's mass and less), which has exhausted the fuel for its nuclear reactions and shines only by radiating away its stored-up heat.

White Dwarf: A dying star that has collapsed to approximately the size of the Earth and is slowly cooling.
XMM-Newton; Europe's X-Ray Observatory ...

white dwarf
The small remnant star left after a low mass star explodes and creates a planetary nebula.

White Dwarf Stars
Dying stars that have collapsed to the size of the earth and are slowly cooling off; at the lower left of the H-R diagram.
Winter Solstice ...

White Dwarf
A very small, white star that is the remnant core of a star that has completed fusion in its core. The sun will become a white dwarf.

White dwarf. A very small, dense star that has used up its nuclear energy. Stars of this kind are at the end of their evolution.

white dwarf: The remains of a dying star that has collapsed to the size of Earth and is slowly cooling off; at the lower left of the H-R diagram.
Widmanstätten patterns: Bands in iron meteorites due to large crystals of nickel-iron alloys.

White Dwarf - A small, dense star that is supported against gravity by the degenerate pressure of its electrons
Wide Pair - A binary star system in which the components are so distant from one another that they evolve independently ...

WHITE DWARF
A white dwarf is a small, very dense, hot star near the end of its life. It is made mostly of carbon. These faint stars are what remains after a red giant star loses its outer layers. Their nuclear cores are depleted.

white dwarf: A star that is the remnant core of a star that has completed fusion in its core. The sun will become a white dwarf.

White dwarf- a collapsed core of a normal star such as the sun after it has lost its outer layers
White hole- the exact opposite of a black hole; an object that spews out matter and energy ...

A White Dwarf Star
According to the The Bright Star Catalog Sirius B has an effective temperature of about 32, ...

[edit] White dwarfs
Main article: White dwarf
For a star of 1 solar mass, the resulting white dwarf is of about 0.6 solar masses, compressed into approximately the volume of the Earth.

White Dwarf
A white, small, very dense star. The Sun will be in this state in about 6,00 million years.
X ...

White Dwarf
No burning
Now we consider the fate of stars that definitely will not end as white dwarf stars, namely the massive stars with masses greater than 10 Mo. These correspond to spectral classes O, B, and some A stars.

White Dwarf Star
The hot, compact remains of a low-mass star like our Sun that has exhausted its sources of fuel for thermonuclear fusion. White dwarf stars are generally about the size of the Earth.

White dwarf: A small, dense stellar remnant that was formed from a dying star whose dead mass was less than 1.4 solar masses. These are unltraviolet emitters.
X
XMM-Newton: An orbiting observatory.

White dwarf
A white dwarf, also called a degenerate dwarf, is a small star composed mostly of electron-degenerate matter.

White Dwarf
LUMINOSITY
Luminosity is the total brightness of a star (or ). Luminosity is the total amount of energy that a star radiates each second (including all of ). The is a as a G2V type star.

white dwarf - (n.)
The final stage of the evolution of a star of between 0.07 and 1.4 solar masses; a star supported by electron degeneracy. white dwarfs are found to the lower left of the main sequence of the H-R diagram.
Wien's law - (n.) ...

White Dwarf Stars - These are stars found in the lower left corner of the graph. They are generally on the left side, so this means that they are pretty hot. They are also very faint.

White Dwarf
A very small, white star formed when an average sized star uses up its fuel supply and collapses. This process often produces a planetary nebula, with the white dwarf star at its center.
X ...

A white dwarf 4 pc distant; density 4 × 105 g cm-3. [H76]
Vanadium
A silvery transition element used in alloy steels.
Symbol: V; m.p. 1890°C; b.p. 3380°C; r.d. 6.1 (20°C); p.n. 23; r.a.m. 50.94. [DC99]
Vapor Pressure ...

"A white dwarf is like a smoking cinder from a burnt-out fire," Williams said. "If you pour gasoline on it, it will explode." ...

The white dwarf, which was about the size of the Earth, collapses into a neutron star, which has a diameter about that of a typical large city. Neutron stars are held from further collapse by the quantum mechanical nature of the neutrons within them.

This white dwarf has since been the subject of much study. Named Sirius B or The Pup, it is an eighth-magnitude star with an estimated radius of only 10,000 km (about twice the size of the earth).

[5.2] WHITE DWARFS AND ELECTRON DEGENERACY
[5.3] THE STRUCTURE AND EVOLUTION OF WHITE DWARFS
[5.4] WHITE DWARFS AND THE AGE OF THE UNIVERSE ...

If the white dwarf and main sequence remnant of a close double are close enough, the white dwarf can raise tides in the main sequence star, and mass will flow the other way, from the main sequence star to the white dwarf.

A typical white dwarf is slightly smaller than the Earth, but with about the same mass as our Sun. Its density is about 300,000 times of a rock. After it has radiated away all its residue energy, it becomes a black dwarf.

white dwarf stars (High Energy Astrophysics Dictionary- GSFC) A star that has exhausted most or all of its nuclear fuel and has collapsed to a very small size. Typically, a white dwarf has a radius equal to about 0.

white dwarf a whitish star of high surface temperature and low intrinsic brightness with a mass approximately equal to that of a Sun but with a density many times larger. X
Y ...

Your Weight on a White Dwarf Star
Article Page
The constellations Cassiopeia and Crux (better known as the Southern Cross) are like flip sides of a coin. You'll never see them in the sky together.

Sirius B is a white dwarf, a star at the end of its life. An extremely dense object, it is slowly cooling down because it is no longer fusing atoms in its core to produce energy. At the end of its life, the Sun will also become a white dwarf.

The shrinking of a white dwarf releases some energy (as light and heat) but eventually it reaches its minimal size. During the shrinking it changes color from blue to white to yellow and to red.

NOVA
A nova is a white dwarf star that suddenly increases in brightness by several magnitudes. It fades very slowly.
...

Astronomers suspect white dwarfs as the culprits because Type Ia supernovae typically occur in regions of space that contain mostly older stars, suggesting that a Type Ia is the explosion of a long-lived star.

The same lensing calculations also apply locally, forming the heart of several massive projects aimed at seeing what the contribution of white dwarfs, red dwarfs, brown dwarfs, and loose "rogue" planets is to the Milky Way's mass.

A type of magnetic cataclysmic binary that consists of a closely-orbiting dwarf M star or K star and a super-strong magnetic white dwarf primary, ...