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Brief thermal runaway nuclear fusion in the core of low-mass stars
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
Helium_flash
Loss of control of an exothermal process due to temperature increases
dramatic event in the normal evolution of solar-mass stars, known as the "helium flash". Chemical reactions involving thermal runaway are also called thermal
Thermal_runaway
Star in the constellation Sagittarius
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
Sakurai's_Object
Changes to stars over their lifespans
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
Stellar_evolution
Stars with a supergiant luminosity class with a spectral type of K or M
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
Red_supergiant
Type of large cool star
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
Red_giant
Blue star with strong helium lines
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
Helium_star
Grouping of evolved cool luminous stars
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
Asymptotic_giant_branch
Portion of the giant branch before helium ignition
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
Red-giant_branch
American nuclear fusion and energy company
Both SPARC and ARC plan to use deuterium-tritium fuel, which produces helium as a by-product. SPARC is predicted to have a burning plasma. That means
Commonwealth_Fusion_Systems
Low-mass supergiant that is almost devoid of hydrogen
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.
Extreme_helium_star
Clustering of stars in astronomy diagram
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
Red_clump
Large self-illuminated object in space
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
Star
Stage of stellar evolution
expands, producing an event called helium flash. Non-degenerate cores initiate fusion more smoothly, without a flash. The output of this event is absorbed
Horizontal_branch
Star at the centre of the Solar System
relatively brief period. First, the core (full of degenerate helium) ignites violently in the helium flash; it is estimated that 6% of the core—by then itself
Sun
Stellar classification
degenerate helium core abruptly ignites in a helium flash fusing helium, and the star passes on to the horizontal branch. As the core helium supply starts
G-type_main-sequence_star
Brightest star in the constellation Boötes
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
Arcturus
Hypothetical class of star that develops from a red dwarf
dwarfs at any stage of their lives to merge and become larger stars, such as helium stars. Such stars should ultimately also become white dwarfs, which like
Blue_dwarf_(red-dwarf_stage)
Creation of chemical elements within stars
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
Stellar_nucleosynthesis
Theoretical stellar remnant
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
Black_dwarf
Nuclear explosion in a white dwarf star
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
Nova
Star whose atmosphere contains more carbon than oxygen
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
Carbon_star
Stage of stellar evolution
stars on the red-giant branch (RGB) have an inert helium core and remain on the RGB until a helium flash moves them to the horizontal branch. However, stars
Blue_loop
Double stars that show a significant interaction between their components
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
Interacting_binary_star
Hypothesized alternative to a black hole
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Gravastar
Topics referred to by the same term
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
Helium_(disambiguation)
Classification in astronomy
Intermediate polar X-ray binary Supersoft X-ray source Binary pulsar Helium flash Carbon detonation Properties Pulsating Urca process Electron-degenerate
Compact_object
Dim, low mass stars on the main sequence
convective. Hence, the helium produced by the thermonuclear fusion of hydrogen is constantly remixed throughout the star, avoiding helium buildup at the core
Red_dwarf
Gas and dust surrounding a newly formed star
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Protoplanetary_disk
Region at the center of a star
allow for energy production through thermonuclear fusion of hydrogen into helium. This energy in turn counterbalances the mass of the star pressing inward;
Stellar_core
Stellar core remnant
to helium and an expanding helium shell that fuses to create a carbon and oxygen core by the triple-alpha process. Alternate fusing of the helium shell
White_dwarf
Light from the 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
Starlight
Central region of the Sun
distinct reactions in which four hydrogen nuclei may eventually result in one helium nucleus: the proton–proton chain reaction – which is responsible for most
Solar_core
Supernova that ejects a large mass at unusually high velocity
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
Hypernova
Type of star, larger and brighter than the Sun
star becomes a subgiant. The inert helium core continues to grow and increase in temperature as it accretes helium from the shell, but in stars up to
Giant_star
Scientific projections regarding the far future
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
Timeline_of_the_far_future
Stellar classification distinguished by bright blue luminosity
type B-type stars was the presence of non-ionized helium lines with the absence of singly ionized helium in the blue-violet portion of the spectrum. All
B-type_main-sequence_star
Nuclear fusion reaction
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
Triple-alpha_process
Stellar classification
strong absorption lines of ionised helium, strong lines of other ionised elements, and hydrogen and neutral helium lines weaker than spectral type B.
O-type_star
Hypothetical early-universe star with a black hole core
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
Quasi-star
Stellar classification
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
F-type_main-sequence_star
Hot, giant star of early spectral type
burning helium in their cores. Depending on mass and chemical composition these stars gradually move bluewards until they exhaust the helium in their
Blue_giant
Early stage in the process of star formation
later become a main-sequence star at the onset of hydrogen fusion producing helium. The modern picture of protostars, summarized above, was first suggested
Protostar
Star of relatively small size and low luminosity
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
Dwarf_star
2001 short story by Liu Cixin
home planet for humanity. However, the sun has already released the helium flash that caused the mission and turned the Earth into an endless wasteland
The_Micro-Era
Stellar classification
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
K-type_main-sequence_star
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
List_of_proper_names_of_stars
Calculated property of a star or planet
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Effective_temperature
Star's outer shell from which light is radiated
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Photosphere
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
List_of_brightest_stars
Unit of time
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Galactic_year
Star in the constellation Monoceros
brightening may have been a so-called helium flash, where the core of a dying low-mass star suddenly ignites helium fusion disrupting, but not destroying
V838_Monocerotis
Star whose brightness fluctuates, as seen from Earth
carbon-oxygen white dwarf with a helium white dwarf, or the central stellar remnant from a planetary nebula undergoes helium flash, becoming a supergiant. DY
Variable_star
Stars with distinctly unusual metal abundances
peculiar stars (CP stars) are stars with distinct patterns of metal and helium abundances, at least in their surface layers. Chemically peculiar stars
Chemically_peculiar_star
Astronomical objects of planetary size that did not form in orbit around a star
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Sub-brown_dwarf
Star not gravitationally bound to any galaxy
measure of the proportion of chemical elements other than hydrogen and helium within a star) indicating an inner galactic origin, since stars outside
Intergalactic_star
Type of star
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Strange_star
Main sequence star that is more luminous and bluer than expected
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Blue_straggler
Astronomical category of 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
Iron_star
Hypothetical astronomical object
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Planck_star
Isolated, small, and opaque nebula
(about 4.5×1047 m3). They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) silicate dust. Bok globules most commonly result
Bok_globule
Velocity of an object as the rate of distance change between the object and a point
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Radial_velocity
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Lists_of_stars
Type of neutron star with beams of radiation
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Pulsar
Flow of gas ejected from the upper atmosphere of a star
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Stellar_wind
Light emitted by the Sun
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Sunlight
Astronomical object without the mass to sustain hydrogen fusion
objects like brown dwarfs do not have enough mass to fuse hydrogen and helium, hence do not undergo the usual stellar evolution that limits the lifetime
Substellar_object
Primary distance indicator used in astronomy
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
Tip_of_the_red-giant_branch
Event wherein the Sun is obscured by the Moon
which the astronauts observed both the solar corona as well as "impact flashes" from meteoroids striking the dark portion of the Moon. They were also
Solar_eclipse
Stars that have properties between Asymptotic Giant Branch stars and red supergiants
carbon–oxygen cores that are large enough to ignite carbon in a flash analogous to the earlier helium flash. The second dredge-up is very strong in this mass range
Super-AGB_star
Main-sequence star of spectral type O
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
O-type_main-sequence_star
Hypothetical types of stars
and electrons, which are fermions, but also contain a large proportion of helium-4 nuclei, which are bosons, and smaller amounts of various heavier nuclei
Exotic_star
Hypothetical star heated by dark-matter annihilation
dark star is predicted to be an enormous cloud of molecular hydrogen and helium ranging between 1 and 960 astronomical units (AU) in radius; its surface
Dark_star_(dark_matter)
Star that has a supergiant luminosity class, with a spectral type of F or G
degenerate helium cores after they leave the main sequence and ascend to the tip of the red-giant branch where they ignite helium in a flash. They then
Yellow_supergiant
Hot, luminous star with a spectral type of A9 or earlier
evolutionary phase between high-mass, hydrogen-fusing main-sequence stars and helium-fusing red supergiants, although new research suggests they could be the
Blue_supergiant
Continuous band of stars that appears on plots of stellar color versus brightness
concentrated at the core will trigger the nuclear fusion of hydrogen into helium (see stars). The thermal energy from this process radiates out from the
Main_sequence
Outermost layer of a star's atmosphere
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Stellar_corona
Comparison of a wide range of physical powers
-22. Deupree, Robert G.; Wallace, Richard K. (June 1, 1987). "The Core Helium Flash and Surface Abundance Anomalies". The Astrophysical Journal. 317: 724
Orders_of_magnitude_(power)
Outer region of the volume of a star
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Stellar_atmosphere
Hypothetical compact star
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Q_star
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
List_of_nearest_stars
Mass of a star in astronomy
do enter the AGB, where they develop a degenerate helium core. Intermediate-mass stars undergo helium fusion and develop a degenerate carbon–oxygen core
Stellar_mass
Collapsed core of a massive star
for those that are especially rich in elements heavier than hydrogen and helium. There are thought to be around one billion neutron stars in the Milky Way
Neutron_star
Type of star
Helium-weak stars are chemically peculiar stars which have a weak helium lines for their spectral type. Their helium lines place them in a later (i.e.
Helium-weak_star
Stage in the evolution of some stars
the asymptotic giant branch, after a flash occurs in a helium-burning shell. The third dredge-up brings helium, carbon, and the s-process products to
Dredge-up
Coming together of two 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
Stellar_collision
Scatter plot of stars showing the relationship of luminosity to stellar classification
around an inert helium core, the red giant branch; stars fusing helium in their cores, the horizontal branch; and stars fusing helium and hydrogen in
Hertzsprung–Russell_diagram
Small number of stars that orbit each other
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Star_system
Class of young variable 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
T_Tauri_star
List of the hottest known 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
List_of_hottest_stars
Hypothetical hybrid star type
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Thorne–Żytkow_object
Classification of stars based on spectral properties
DB – a helium-rich atmosphere, indicated by neutral helium, He I, spectral lines. DO – a helium-rich atmosphere, indicated by ionized helium, He II,
Stellar_classification
B-type star with emission lines
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Be_star
Type of star that is massive and luminous
(R☉). They are massive enough to begin helium-core burning gently before the core becomes degenerate, without a flash and without the strong dredge-ups that
Supergiant
Black hole formed by a collapsed star
moderate metallicity (low abundance of elements other than hydrogen and helium – a situation common in Population III stars). However, this mass gap is
Stellar_black_hole
Structure formed by diffuse material in orbital motion around a massive central body
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Accretion_disk
Extremely hot white dwarf
oxygen, similar to H 1504+65. This CO abundance is probably due to a late helium flash while the star was still main sequence. A collision between two CO rich
RX_J0439.8−6809
Pattern of stars recognized on Earth's night sky
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Asterism_(astronomy)
Object with escape velocity exceeding the speed of light
Nucleosynthesis Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process C burning Ne burning O burning Si
Dark star (Newtonian mechanics)
Dark_star_(Newtonian_mechanics)
Set of nuclear fusion reactions
is an oxygen-burning shell, followed by a neon shell, a carbon shell, a helium shell, and a hydrogen shell. The oxygen-burning process is the last nuclear
Oxygen-burning_process
HELIUM FLASH
HELIUM FLASH
Boy/Male
Indian
Medium
Boy/Male
Greek
God of the sun.
Male
English
 Anglicized form of Greek Elioud, ELIUD means "God his glory." In the New Testament bible, this is the name of an ancestor of Christ. English name of a legendary king of the Britons who was preceded by Urianus and succeeded by Cledaucus.
Girl/Female
Biblical
Rupture, fracture.
Male
Greek
(á¼Î»Î¹Î¿Ï‚) Greek name HELIOS means "sun." In mythology, this is the name of a sun god.
Boy/Male
German
Brave.
Male
English
Anglicized form of Irish Gaelic Féidhlim, possibly FELIM means "ever good."
Girl/Female
Muslim
Male
English
Anglicized form of Irish Gaelic Féidhlim, possibly PHELIM means "hospitable."
Girl/Female
Greek
From Helicon.
Boy/Male
American, British, English
Lives at the Hall's Slopes
Male
Greek
(Ἡλί) Greek form of Hebrew Eliy, HELI means "ascending." In the New Testament bible, this is the name of the father of Mary's husband Joseph.
Girl/Female
Arabic, Muslim
Very Soft; Gentle
Boy/Male
Irish
Good forever.
Girl/Female
Greek
From Helicon.
Surname or Lastname
English and Scottish
English and Scottish : variant spelling of Hallam.Norwegian : habitational name from any of three farmsteads so named in southeastern Norway, from either the dative plural of Old Norse hǫll ‘slope’ or Old Norse Hallheimr, a compound of hallr ‘slope’ + heimr ‘farmstead’.
Surname or Lastname
English
English : probably a variant of Helms.
Surname or Lastname
Swedish (also frequent in Finland)
Swedish (also frequent in Finland) : ornamental name from an unexplained first element + the suffix -lin or -in, common suffixes of surnames.French (Hélin) : from a pet form of Hélie (see Helie 1).French (Hélin) : from the Germanic personal name Heilin, a short form of any of various compound names with the first element heil (see Heilmann 2).English : variant of Hillian.
Surname or Lastname
English
English : variant spelling of Kellam.
Male
Turkish
(سليم) Turkish form of Arabic Salim, SELIM means "safe."
HELIUM FLASH
HELIUM FLASH
Boy/Male
Arabic
God Gift
Girl/Female
Dutch
Of. The Dutch equivalent of 'de' in French names. Some early immigrants to America who dropped...
Girl/Female
Hindu
The best
Boy/Male
Tamil
Celebrated or renowned, Much heard of, Famous, Pleased, Delighted, Happy, Son of Vasudeva (Brahma purana, Lord Vishnu
Male
English
Anglicized form of Hebrew Maday, MADAI means "middle" or "middle land." In the bible, this is the name of a place and the name of a son of Japheth and the people who descended from him.
Boy/Male
Indian
One who warns, Bright, Radiant, Blooming, Observer, Supervisor
Boy/Male
Arabic, Muslim
Divinity of Wisdom
Girl/Female
Spanish
Present.
Surname or Lastname
English
English : variant of Fern 1.Norwegian : habitational name from a farm so named, from far ‘road’, ‘track’ + nes ‘headland’, ‘promontory’.
Girl/Female
Indian
Full of great happiness
HELIUM FLASH
HELIUM FLASH
HELIUM FLASH
HELIUM FLASH
HELIUM FLASH
a.
Resembling vellum.
a.
Having a middle position or degree; mean; intermediate; medial; as, a horse of medium size; a decoction of medium strength.
n.
A substance through which an effect is transmitted from one thing to another; as, air is the common medium of sound. Hence: The condition upon which any event or action occurs; necessary means of motion or action; that through or by which anything is accomplished, conveyed, or carried on; specifically, in animal magnetism, spiritualism, etc., a person through whom the action of another being is said to be manifested and transmitted.
n.
A nonplane curve whose tangents are all equally inclined to a given plane. The common helix is the curve formed by the thread of the ordinary screw. It is distinguished from the spiral, all the convolutions of which are in the plane.
n.
The part of a gland, or similar organ, where the blood vessels and nerves enter; the hilus; as, the hilum of the kidney.
n.
A gaseous element found in the atmospheres of the sun and earth and in some rare minerals.
v. t.
To cover or furnish with a helm or helmet.
pl.
of Medium
pl.
of Folium
pl.
of Xenium
pl.
of Folium
n.
Oxide of thulium.
n.
See Tedium.
n.
The cartilaginous cap at the sacral end of the ilium of some animals.
n.
pl. of Medium.
pl.
of Medium
n.
An oxide of holmium.
a.
Having but one cilium.
a.
Having a medium size; as, a medium-sized man.
n.
See Peliom.