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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 ...
White dwarfs with hydrogen-poor atmospheres, such as WD J2147–4035, are less affected by CIA and therefore have a yellow to orange color. [80] [77] The white dwarf cooling sequence seen by ESA's Gaia mission. White dwarf core material is a completely ionized plasma – a mixture of nuclei and electrons – that is
Pages in category "White dwarfs" The following 167 pages are in this category, out of 167 total. ... Post common envelope binary; Procyon; PSR B1620−26; PSR J0348+0432;
GD 362 is a white dwarf approximately 150 light years from Earth. [5] In 2004, spectroscopic observations showed that it had a relatively high concentration of metals in its atmosphere . Since the high gravitational field of white dwarfs quickly forces heavy elements to settle towards the bottom of the atmosphere, this meant that the atmosphere ...
About 6% of white dwarfs show infrared excess due to a disk around a white dwarf. [66] In the past only a relative small sample of white dwarf disks was known. [67] Due to advances in white dwarf detection (e.g. with Gaia or LAMOST) and improvement of WISE infrared catalogs with unWISE/CatWISE, the number has increased to hundreds of candidates.
A family from a Ba Aka pygmy village. The term pygmy, as used to refer to diminutive people, comes via Latin pygmaeus from Greek πυγμαῖος pygmaîos, derived from πυγμή pygmḗ, meaning "short cubit", or a measure of length corresponding to the distance from the elbow to the first knuckle of the middle finger, meant to express pygmies' diminutive stature.
A pulsating white dwarf is a white dwarf star whose luminosity varies due to non-radial gravity wave pulsations within itself. Known types of pulsating white dwarfs include DAV, or ZZ Ceti, stars, with hydrogen-dominated atmospheres and the spectral type DA; [1] DBV, or V777 Her, stars, with helium-dominated atmospheres and the spectral type DB; [2] and GW Vir stars, with atmospheres dominated ...
Of the seven musk deer species in the world, six are found in China and five are endangered: the Anhui musk deer and dwarf musk deer of central China, the alpine musk deer of western China, the white-bellied musk deer and black musk deer of Tibet. The Siberian musk deer in the northeast is considered vulnerable. The lesser mouse-deer is found ...