Astrophysicists at UC Santa Barbara are the first scientists to identify two
white dwarf stars in an eclipsing binary system, allowing for the first direct radius measurement of a rare white dwarf composed of pure helium.
UC Santa Barbara Astrophysicists are the first to identify two
white dwarf stars in an eclipsing binary system, allowing for the first direct radius measurement of a rare white dwarf.
Observations of the explosions of
white dwarf stars in binary systems, so - called Type Ia supernovae, in the 1990s then led scientists to the conclusion that a third component, dark energy, made up 68 % of the cosmos, and is responsible for driving an acceleration in the expansion of the universe.
Astronomers have identified
a white dwarf star in our galaxy that may be the leftover remains of a recently discovered type of supernova.
Type Iax supernovae may be caused by the partial destruction of
a white dwarf star in such an explosion.
Type Ia supernovae are caused by the complete destruction of
a white dwarf star in a thermonuclear explosion.
A UCLA - led team of scientists discovered
a white dwarf star in the constellation Boötes whose atmosphere is rich in carbon, nitrogen, oxygen and hydrogen.
A white dwarf star in a binary orbit with a neighbour can slowly pull material off, gradually increasing its own...
Type Ia supernovae are fairly rare in the nearby Universe and represent the explosion of at least one
white dwarf star in a binary system.
Not exact matches
The extremely strong gravity of a massive neutron
star in orbit with a companion
white dwarf star puts competing theories of gravity to a test more stringent than any available before
Astronomy is beginning to detect and classify a life of the
stars, red, blue and
white, giant, middle - sized and
dwarf; each type,
in its dimensions, particular radiations and brilliance, being subject to a given evolutionary cycle.
Right: After a couple hundred million years, the red giant
star has burned out and collapsed to the
white dwarf that shines intensely
in ultraviolet wavelengths.
The study, «Accretion - induced variability links young stellar objects,
white dwarfs, and black holes», which is published
in the journal Science Advances, shows how the «flickering»
in the visible brightness of young stellar objects (YSOs)-- very young
stars in the final stages of formation — is similar to the flickering seen from black holes or
white dwarfs as they violently pull matter from their surroundings
in a process known as accretion.
It was named
in honor of Indian - American physicist Subrahmanyan Chandrasekhar who is known for determining the mass limit for
white dwarf stars to become neutron
stars.
OXYGEN on a planet might be a sign of life, but
in two odd
white dwarf stars it could indicate a narrow escape from violent death.
Locked
in a deadly embrace, two
white dwarf stars may be the strongest source of gravitational waves now flooding our galaxy.
• How might the burned - out
stars called
white dwarfs be brought to ruin by other
stars in so - called Type Ia supernovae, inciting the fiery alchemy that yielded much of the iron
in our blood and the potassium
in our brains?
For the first time, scientists using NASA's Hubble Space Telescope have witnessed a massive object with the makeup of a comet being ripped apart and scattered
in the atmosphere of a
white dwarf, the burned - out remains of a compact
star.
The
white dwarf star is located about 570 light - years from Earth
in the constellation Virgo.
In this artist's conception, a Ceres - like asteroid is slowly disintegrating as it orbits a
white dwarf star.
The three bands then correspond to the galactic center of a galaxy
in the Hubble field and the interacting galaxy, the center of a bright
star in the Magellanic cloud and a
star cluster and the last band corresponds to the
white dwarf in the Helix and Cat's eye nebulae.
CANNIBAL ZOMBIE STAR Dead
stars called
white dwarfs (left) steal material from ordinary companion
stars (right), as shown
in this artist's illustration.
The diffuse cloud
in this image, taken with the Carnegie Institution for Science's Swope telescope
in Chile, is the shell of hot hydrogen gas ejected by a
white dwarf star on March 11, 1437.
The X-ray perspective is dotted with torrid
white dwarfs and neutron
stars and bathed
in multimillion - degree gas.
For the past two years, Winget and his colleagues at the University of Texas at Austin and Sandia National Laboratory
in Albuquerque, New Mexico, have been creating searing plasmas that are,
in effect, miniature versions of
white dwarfs, ancient
stars that have burned up all their nuclear fuel.
WHAT LIES WITHIN The inner structure of a
white dwarf star (shown
in this artist's impression) has been mapped for the first time — and it's more oxygen - rich than expected.
Imagine being able to view microscopic aspects of a classical nova, a massive stellar explosion on the surface of a
white dwarf star (about as big as Earth),
in a laboratory rather than from afar via a telescope.
Led by Christopher Manser of the University of Warwick's Astrophysics Group, the researchers investigated the remnants of planetary systems around
white dwarf stars;
in this instance, SDSS1228 +1040.
That happens if it has a companion
star, as most
stars in the galaxy do, and the
white dwarf orbits it closely enough to steal material from it.
But it turns out
white dwarfs can breach that tipping point
in another situation: Instead of a giant
star losing material to a
white dwarf, two
white dwarfs orbiting each other could slam together and explode.
In 2014, scientists found another reason to rejoice in your genes» deterioration: White dwarf stars, like the remnant that will remain at the end of the sun's life, eat rocky planets like Earth for their last mea
In 2014, scientists found another reason to rejoice
in your genes» deterioration: White dwarf stars, like the remnant that will remain at the end of the sun's life, eat rocky planets like Earth for their last mea
in your genes» deterioration:
White dwarf stars, like the remnant that will remain at the end of the sun's life, eat rocky planets like Earth for their last meal.
«The cool thing,
in this case, is that the lensing effect is so strong, we are able to use that to measure the mass of the closer,
white dwarf star.
In their new study, the Leicester - led team assesses whether these laws are the same within the hot, dense conditions in the atmosphere of a dying white dwarf star as here on Eart
In their new study, the Leicester - led team assesses whether these laws are the same within the hot, dense conditions
in the atmosphere of a dying white dwarf star as here on Eart
in the atmosphere of a dying
white dwarf star as here on Earth.
The
white dwarf, a cooling
star thought to be
in the final stage of life, is about Earth's size but 200,000 times more massive.
Such
stars end their lives
in huge supernova explosions, ejecting their stellar materials outwards into space and leaving behind an extremely dense and compact object; this could either be a
white dwarf, a neutron
star or a black hole.
When a
white dwarf grows heavier than this, it can no longer support its own weight and starts collapsing, triggering nuclear reactions that rip the
star to shreds
in a type 1a supernova.
Two
white dwarf stars orbiting each other will collide
in 900,000 years, possibly annihilating both.
There are many
white dwarfs that hold large amounts of hydrogen
in their atmospheres, and this new study suggests that this is evidence that water - rich asteroids or comets are common around other
stars than the Sun.»
These so - called supersoft sources are now thought to be
white dwarf stars that cannibalize their stellar companions and then,
in many cases, explode
The first hint of the kamikaze asteroids came about 40 years ago, when astronomers discovered heavy elements such as magnesium
in the spectra of some
white dwarf stars.
[3] Type Ia Supernovae occur when an accreting
white dwarf in a binary
star system slowly gains mass from its companion until it reaches a limit that triggers the nuclear fusion of carbon.
The discovery came as a complete surprise, as the team assumed the dusty
white dwarf was a single
star but co-author Dr Steven Parsons (University of Valparaíso and University of Sheffield), an expert
in double
star (or binary) systems noticed the tell - tale signs.
A whole new class of carbon - dominated
white dwarf stars is a «major discovery,» says astronomer Pierre Bergeron of the University of Montreal
in Canada.
«Any metals we see
in the
white dwarf will disappear within a few weeks, and sink down into the interior, unless the debris is continuously flowing onto the
star.
Old
stars are coming unglued on the way to becoming
white dwarfs — and astronomers confidently predict that
in 5 billion years the sun will be an old
star.
In short order, astronomically speaking, the red giant blows off its outer layers and leaves behind a
white dwarf — essentially the naked heart of the
star — which slowly cools to eternal blackness.
The fastest pulsars are
in binary systems with another object, like a
star or a
white dwarf.
In some alternate theories of gravity that could take over if general relativity turns out to be wrong, the neutron
star could have gravitational effects going on inside it that the relatively willowy
white dwarf would not.
In particular, the CDF - S source is likely associated with the complete destruction of a neutron star or white dwarf, and is roughly 100,000 times more luminous in X-ray
In particular, the CDF - S source is likely associated with the complete destruction of a neutron
star or
white dwarf, and is roughly 100,000 times more luminous
in X-ray
in X-rays.
According to a report published today
in the journal Nature, some of the emissions come from discrete sources representing hundreds of never - before - seen
white dwarf stars, neutron
stars and black holes.