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Sirius B, which is a white dwarf, can be seen as a faint point of light to the lower left of the much brighter Sirius A. A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: in an Earth sized volume, it packs a mass that is comparable to the Sun.
The white dwarf existed for 10.21 ±0.22 Gyrs, meaning the total age is 10.7 ±0.3 Gyrs. [1] Cold white dwarfs are often strongly affected by collision induced absorption (CIA) of hydrogen. This can lead to faint optical red and infrared brightness. These white dwarfs are also called IR-faint white dwarfs. WD J2147–4035 is however very red (r ...
Carbon detonation or carbon deflagration is the violent reignition of thermonuclear fusion in a white dwarf star that was previously slowly cooling. It involves a runaway thermonuclear process which spreads through the white dwarf in a matter of seconds, producing a type Ia supernova which releases an immense amount of energy as the star is blown apart.
White dwarfs are the slowly cooling stars that have cast off their outer layers during the last stages of their lives. Hubble discovers hydrogen-burning white dwarfs enjoying slow ageing Skip to ...
Like other white dwarfs, it is a very dense star: its mass has been estimated to be about 67% of the Sun's, [27] yet it has only 1% of the Sun's radius (1.23 times the Earth's radius) [7] [a] The outer atmosphere has a temperature of approximately 6,110 K, [27] which is relatively cool for a white dwarf. As all white dwarfs steadily radiate ...
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently to no longer emit significant heat or light. Because the time required for a white dwarf to reach this state is calculated to be longer than the current age of the universe (13.8 billion years), no black dwarfs are expected to exist in the ...
If a white dwarf forms a close binary system with another star, hydrogen from the larger companion may accrete around and onto a white dwarf until it gets hot enough to fuse in a runaway reaction at its surface, although the white dwarf remains below the Chandrasekhar limit. Such an explosion is termed a nova.
The ancient Roman god Janus was two-faced, literally - with one looking forward and another backward, representing transitions and duality. Scientists have observed a white dwarf star - a hot ...