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...

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...

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...

less dramatic event in the normal evolution of solar-mass stars, the "helium flash". Chemical reactions involving thermal runaway are also called thermal...

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...

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...

so-called helium flash. In more-massive stars, the collapsing core will reach these temperatures before it is dense enough to be degenerate, so helium fusion...

An extreme helium star (abbreviated EHe) is a low-mass supergiant that is almost devoid of hydrogen, the most common chemical element of the Universe....

lobe overflow of the primary occurs prior to helium flash, the shedding of mass can leave behind a helium white dwarf with a mass as low as 0.1 M☉. The...

expands, producing an event called helium flash. Non-degenerate cores initiate fusion more smoothly, without a flash. The output of this event is absorbed...

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...

-22. Deupree, Robert G.; Wallace, Richard K. (June 1, 1987). "The Core Helium Flash and Surface Abundance Anomalies". The Astrophysical Journal. 317: 724...

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...

brightest nova of this millennium, reaching magnitude 3.3. A helium nova (undergoing a helium flash) is a proposed category of nova event that lacks hydrogen...

process, known as the helium flash, lasts a matter of seconds but burns 60–80% of the helium in the core. During the core flash, the star's energy production...

would probably be the one previously estimated. Once the Sun stops fusing helium in its core and ejects its layers in a planetary nebula in about 8 billion...

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...

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...

Intermediate polar X-ray binary Supersoft X-ray source Binary pulsar Helium flash Carbon detonation Properties Pulsating Urca process Electron-degenerate...

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...

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...

A helium star is a class O or B star (blue), which has extraordinarily strong helium lines and weaker than normal hydrogen lines, indicating strong stellar...

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...

8 times the mass of the Sun, this will occur in a process called the helium flash. The evolutionary track of the star will then carry it toward the left...

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...

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...

Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si...

later become a main-sequence star at the onset of hydrogen fusion producing helium. The modern picture of protostars, summarized above, was first suggested...

to the Earth as described above. 6.6 billion The Sun may experience a helium flash, resulting in its core becoming as bright as the combined luminosity...

temperatures. 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...