White dwarf - Wikipedia
WEBA 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. A white dwarf's low luminosity comes from the emission of residual thermal energy; no fusion takes place in a white dwarf. [1] .
NASA – How White Dwarf Stars Get Their ‘Kicks’ - Science@NASA
WEBDec 4, 2007 · Red giant stars lose about half their mass by shedding it into space. If more of this mass is ejected in one direction, it could propel the emerging white dwarf through space, just as exhaust from a rocket engine thrusts the …
Spectacular ultraviolet flash may finally explain how white dwarfs ...
WEBJul 23, 2020 · The extremely rare type of supernova is poised to offer insights into dark energy, the creation of heavy metals and the mechanism that causes white dwarfs to explode.
Spectacular UV flash may explain how white dwarfs explode - Phys.org
WEBJul 23, 2020 · An outer layer of helium ignites carbon within the white dwarf, causing an extremely hot double explosion and a UV flash; Two white dwarfs merge, triggering an explosion with colliding ejecta...
Why do white dwarfs shine white? - Physics Stack Exchange
WEBThe hotter something is glowing the more white/blue it appears. A dying medium sized star expands, cools and becomes a red giant for a while, but eventually it is going to gravitationally collapse (once enough Iron (Fe) is accumulated in the core). Then it blows the outer layers away and what is left collapses into a white dwarf.
Imagine the Universe!
WEBSep 23, 2021 · A white dwarf is what stars like the Sun become after they have exhausted their nuclear fuel. Near the end of its nuclear burning stage, this type of star expels most of its outer material, creating a planetary nebula. Only the hot core of the star remains.
White Dwarfs - Imagine the Universe!
WEB(Betelgeuse) January 15, 1996, Hubble Space Telescope Captures First Direct Image of a Star, A. Dupree (CfA) and NASA. This burning shell of hydrogen expands the outer layers of the star. When this happens, our Sun will become a red giant; it will be so big that Mercury will be completely swallowed!
Neutron Stars and White Dwarfs - Center for Astrophysics
WEBAstronomers study the different types of pulsars to understand why they spin at the rates they do, and how they change those rates during the neutron starquakes called “glitches”. Like white dwarfs, some neutron stars are in binaries with other neutron stars, or partnered with ordinary stars.
For the First Time Hubble Directly Measures Mass of a Lone White …
WEBFeb 2, 2023 · Astronomers using NASA's Hubble Space Telescope have for the first time directly measured the mass of a single, isolated white dwarf – the surviving core of a burned-out, Sun-like star. Researchers found that …
Hubble Discovers Hydrogen-Burning White Dwarfs Enjoying Slow …
WEBSep 6, 2021 · New evidence from NASA’s Hubble Space Telescope suggests that white dwarf stars could continue to burn hydrogen in the final stages of their lives, causing them to appear more youthful than they actually are.