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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: its mass is comparable to the Sun 's, while its volume is comparable to Earth 's.
Like the general circumstellar habitable zone, the continuously habitable zone of a star is divided into a conservative and extended region. [ 91 ] In red dwarf systems, gigantic stellar flares which could double a star's brightness in minutes [ 92 ] and huge starspots which can cover 20% of the star's surface area, [ 93 ] have the potential to ...
A K-type star's habitable zone approximately ranges between 0.1–0.4 to 0.3–1.3 AU from the star. Here, exoplanets will receive only a relatively small amount of ultraviolet radiation, especially so towards the outer edge. This is favorable to support life, as it means that there is enough radiated energy to allow liquid water to exist on ...
Van Maanen 2, or van Maanen's Star, is the closest known solitary white dwarf to the Solar System. It is a dense, compact stellar remnant no longer generating energy and has equivalent to about 68% of the Sun's mass but only 1% of its radius. [9] At a distance of 14.1 light-years it is the third closest of its type of star after Sirius B and ...
Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance between the two varies between 8.2 and 31.5 astronomical units as they orbit every 50 years.
The habitability of F-type main-sequence star (or yellow-white dwarf) systems is disputed due to the shorter lifetimes (3-8 Gyrs as opposed to 9-15 Gyrs for G stars) and higher levels of UV radiation. Indeed, F0 stars (7,400 K, 1.6 M ☉︎, 1.7 R ☉︎, ~7 L ☉︎) are considered by many scientists as the hottest and most massive stars ...
For reasons that remain unclear, the mass of Procyon B is unusually low for a white dwarf star of its type. [12] With a surface temperature of 7740 K, it is also much cooler than Sirius B; this is a testament to its lesser mass and greater age. The mass of the progenitor star for Procyon B was about 2.59 +0.22
First solitary white dwarf Van Maanen 2: 1917 Van Maanen's star is also the nearest solitary white dwarf [4] 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 ...