• Thumbnail for Helium flash
    A helium flash is a very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the triple-alpha process in the core of...
    13 KB (1,613 words) - 05:07, 25 March 2024
  • Thumbnail for Thermal runaway
    less dramatic event in the normal evolution of solar-mass stars, the "helium flash". Chemical reactions involving thermal runaway are also called thermal...
    35 KB (4,163 words) - 07:13, 7 February 2024
  • Thumbnail for Stellar nucleosynthesis
    sufficient helium in its core to ignite it. In stars around the mass of the Sun, this begins at the tip of the red giant branch with a helium flash from a...
    36 KB (4,152 words) - 11:49, 22 March 2024
  • Thumbnail for Nova
    Nova (redirect from Helium nova)
    brightest nova of this millennium, reaching magnitude 3.3. A helium nova (undergoing a helium flash) is a proposed category of nova events that lacks hydrogen...
    24 KB (2,673 words) - 04:23, 25 March 2024
  • Thumbnail for Red giant
    so-called helium flash. In more-massive stars, the collapsing core will reach 108 K before it is dense enough to be degenerate, so helium fusion will...
    26 KB (3,361 words) - 21:59, 21 March 2024
  • Thumbnail for Stellar evolution
    pressure, helium fusion will ignite on a timescale of days in a helium flash. In the nondegenerate cores of more massive stars, the ignition of helium fusion...
    49 KB (6,416 words) - 20:50, 5 March 2024
  • Thumbnail for Red-giant branch
    called the first giant branch, is the portion of the giant branch before helium ignition occurs in the course of stellar evolution. It is a stage that follows...
    32 KB (3,933 words) - 15:04, 20 November 2023
  • Thumbnail for Triple-alpha process
    burn helium at its core for about a billion years after the helium flash). For higher mass stars, carbon collects in the core, displacing the helium to...
    20 KB (2,595 words) - 09:32, 10 March 2024
  • rocks Helium fusion, a type of nuclear fusion in stars Helium flash, the sudden beginning of helium fusion in certain kinds of stars Isotopes of helium Helium-3...
    2 KB (256 words) - 12:58, 23 July 2022
  • Thumbnail for Star
    as their core hydrogen is depleted and they begin to burn helium in core in a helium flash; they develop a degenerate carbon-oxygen core later on the...
    145 KB (16,225 words) - 00:24, 1 March 2024
  • Thumbnail for Red supergiant
    helium core during a red giant phase, undergo a helium flash before fusing helium on the horizontal branch, evolve along the AGB while burning helium...
    33 KB (4,208 words) - 21:51, 21 March 2024
  • Thumbnail for Asymptotic giant branch
    up and eventually the helium shell ignites explosively, a process known as a helium shell flash. The power of the shell flash peaks at thousands of times...
    25 KB (3,053 words) - 14:59, 14 February 2024
  • Thumbnail for Sun
    but much happens. First, the core (full of degenerate helium) ignites violently in the helium flash; it is estimated that 6% of the core—itself 40% of the...
    165 KB (18,869 words) - 03:40, 28 March 2024
  • Thumbnail for G-type main-sequence star
    sequence. After this, the star's degenerate helium core abruptly ignites in a helium flash fusing helium, and the star passes on to the horizontal branch...
    12 KB (1,133 words) - 06:50, 25 March 2024
  • Thumbnail for Black dwarf
    processes occur, preventing any supernova explosions. Once the Sun stops fusing helium in its core and ejects its layers in a planetary nebula in about 8 billion...
    10 KB (1,140 words) - 01:38, 17 March 2024
  • Thumbnail for Arcturus
    to do so until it accumulates a large enough degenerate helium core to ignite the helium flash. It has likely exhausted the hydrogen from its core and...
    53 KB (5,300 words) - 18:15, 22 March 2024
  • Thumbnail for Red clump
    stars originally similar to the Sun which have undergone a helium flash and are now fusing helium in their cores. Red clump stellar properties vary depending...
    13 KB (1,655 words) - 05:01, 5 February 2024
  • Thumbnail for Horizontal branch
    expands, producing an event called helium flash. Non-degenerate cores initiate fusion more smoothly, without a flash. The output of this event is absorbed...
    14 KB (1,722 words) - 16:03, 7 September 2023
  • Thumbnail for Sakurai's Object
    believed to currently be in thermal instability and within its final shell helium flash phase. At the time of its discovery, astronomers believed Sakurai's Object...
    21 KB (2,371 words) - 20:28, 10 September 2023
  • allow for energy production through thermonuclear fusion of hydrogen into helium. This energy in turn counterbalances the mass of the star pressing inward;...
    15 KB (1,845 words) - 05:26, 29 January 2024
  • Thumbnail for Dwarf star
    dwarf is a substellar object not massive enough to ever fuse hydrogen into helium, but still massive enough to fuse deuterium – less than about 0.08  M☉ and...
    5 KB (579 words) - 20:08, 17 February 2024
  • Thumbnail for Protostar
    later become a main-sequence star at the onset of hydrogen fusion producing helium. The modern picture of protostars, summarized above, was first suggested...
    11 KB (1,174 words) - 14:08, 19 March 2024
  • Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si...
    7 KB (415 words) - 21:15, 17 April 2023
  • Thumbnail for Quasi-star
    only happen early in the development of the Universe before hydrogen and helium were contaminated by heavier elements; thus, they may have been very massive...
    9 KB (972 words) - 17:52, 18 March 2024
  • the star expands so that the helium fusion ceases, and the hydrogen shell burning restarts. During these shell helium flashes, the mass loss from the star...
    23 KB (2,162 words) - 17:26, 9 March 2024
  • W Deupree, Robert G.; Wallace, Richard K. (June 1, 1987). "The Core Helium Flash and Surface Abundance Anomalies". The Astrophysical Journal. 317: 724...
    52 KB (2,634 words) - 21:17, 26 March 2024
  • Thumbnail for Neutron star
    as iron, simply sink beneath the surface, leaving only light nuclei like helium and hydrogen. If the surface temperature exceeds 106 kelvins (as in the...
    101 KB (11,766 words) - 19:59, 21 March 2024
  • Thumbnail for Photosphere
    surface. The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8%, respectively, of the mass of the Sun...
    9 KB (756 words) - 20:14, 9 February 2024
  • Thumbnail for List of brightest stars
    Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si...
    36 KB (1,313 words) - 10:21, 24 March 2024
  • Thumbnail for Hypernova
    associated with GRB 980425. Its spectrum showed no hydrogen and no clear helium features, but strong silicon lines identified it as a type Ic supernova...
    20 KB (2,185 words) - 12:48, 15 March 2024