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A white dwarf, then, packs mass comparable to the Sun's into a volume that is typically a million times smaller than the Sun's; the average density of matter in a white dwarf must therefore be, very roughly, 1,000,000 times greater than the average density of the Sun, or approximately 10 6 g/cm 3, or 1 tonne per cubic centimetre. [1]
The white dwarf WD 0032−317 is located about 1,400 light years from Earth. [1] WD 0032−317 formed about three billion years ago when a low mass star (possibly of 1.3 solar masses) expanded into its red giant phase. The star then blew out its outer layers leaving behind the helium-rich core (which is WD 0032−317).
The Sun is a G-type main-sequence star (G2V), informally called a yellow dwarf, though its light is actually white. It formed approximately 4.6 billion [ a ] years ago from the gravitational collapse of matter within a region of a large molecular cloud .
WD 0810-353 (UPM J0812-3529) is a white dwarf currently located 36 light-years (11 parsecs) from the Solar System.This stellar remnant may approach the Solar System 29,000 years from now at a distance of around 0.15 parsecs, 0.49 light-years or 31,000 AU from the Sun, crossing well within the proposed boundaries of the Oort cloud. [3]
It is the most massive white dwarf yet found, having 1.35 times the mass of the Sun, nearly the largest expected mass for this type of object. Its radius is about 1,809 km (1,124 mi), [ 2 ] about the size of Earth 's Moon , and it rotates once every 7 minutes.
Lambda is a blue-white B-type main sequence dwarf with an apparent magnitude of 4.48 located around 423 light-years from Earth. [62] It is 3.7 times as wide as and 5.5 times as massive as the Sun, and shines with 940 times its luminosity. [54] Very Large Telescope image of the surroundings of VY Canis Majoris
First white dwarf with a planet WD B1620−26: 2003 PSR B1620-26 b (planet) This planet is a circumbinary planet, which circles both stars in the PSR B1620-26 system [5] [6] First singular white dwarf with a planet WD 1145+017: 2015 WD 1145+017 b: Planet is extremely small and is disintegrating. First white dwarf that is a pulsar: AR Scorpii A ...
G 240-72 is the seventh closest white dwarf (after Sirius B, Procyon B, van Maanen's star, Gliese 440, 40 Eridani B and Stein 2051 B). Its trigonometric parallax is 0.1647 ± 0.0024 arcsec , [ 5 ] corresponding to a distance 6.07 ± 0.09 pc , or 19.80 +0.29