Sentences with phrase «from white dwarf stars»

Radiation from the white dwarf star, the white dot in the center of the ring, is exciting the helium to glow.

Not exact matches

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.

The atmospheres of some white dwarf stars contain heavy elements, which are thought to result from eating asteroids.

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.

Matter falling from a companion star onto a white dwarf might have induced a thermonuclear chain reaction that forced the dwarf to expand radically without exploding into a more common nova, Bond notes.

The white dwarf star is located about 570 light - years from Earth in the constellation Virgo.

CANNIBAL ZOMBIE STAR Dead stars called white dwarfs (left) steal material from ordinary companion stars (right), as shown in this artist's illustration.

The event was what's known as a classical nova explosion, which occurs when a dense stellar corpse called a white dwarf steals enough material from an ordinary companion star for its gas to spontaneously ignite.

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.

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.

A nova can occur if the strong gravity of a white dwarf pulls material from its orbiting companion star.

All type 1a evolve from a type of star called a white dwarf, but pinning down exactly which white dwarfs are supernova precursors could lead to much more precise measurements of dark energy — and even reveal its true nature.

Another, less common kind of supernova, type 1a, occurs when a remnant of a star called a white dwarf steals matter from a companion star until the white dwarf explodes (SN: 4/30/16, p. 20).

At first glance this exploding star had all the features of a type Ia supernova, which happens when a small, dense white dwarf star steals material from an orbiting companion and then explodes.

Sandage's preferred method is to use type Ia supernovae, which arise when a white dwarf star gathers material from a companion and explodes.

But some scientists have suggested the fast - moving stars near the cluster centres could instead result from the gravity of many dim, dead stars such as white dwarfs or neutron stars.

That is because white dwarfs are 1000 times dimmer than stars like the Sun, which are so bright that they overwhelm any reflected light from planets around them.

When Sigurdsson and colleagues analyzed images of the white dwarf from the Hubble Space Telescope, they concluded that the distant, unseen companion is not a low - mass star, as many researchers had thought, but a planet with about 2.5 times the mass of Jupiter.

[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 explosion was a Type Ia supernova, the most luminous variety, which occurred when a small, dense star known as a white dwarf blew up about 7000 light - years from Earth.

The spacecraft's telescopes are sensitive to radiation from the hot outer atmospheres of stars like the Sun and white dwarfs, formed when stars about the size of the Sun reach the end of their lives.

Neither study searched for the stars responsible for so - called type Ia supernovae, which are explosions of white dwarf stars that have grown overweight by feasting on material from a companion star.

The UCSB - led research implies that the white dwarf was stealing matter from a much larger companion star — approximately 20 times the radius of the sun — which caused the white dwarf to explode.

As general relativity predicts, light from the background star bent around the white dwarf, distorted by its gravitational field.

Astronomers thought white dwarfs gained mass from a companion star, but about half of the type Ia supernovae show no signs of a companion.

The first so - called helium nova, the possible result of a large white dwarf sucking material from a hydrogen - deficient companion star, may be a precursor to a supernova

The white dwarf accretes material from the companion star, then at some point, it might explode as a type Ia supernova.

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.

Specifically, the most energetic iron emission they studied is characteristic of so - called x-ray binary starsduos comprised of a dense stellar object such as a white dwarf star, a neutron star or a black hole that collects matter from a less dense companion, emitting x-rays in the process.

Kailash Sahu and colleagues at the Space Telescope Science Institute in Baltimore, Maryland, measured bending light from white dwarf Stein 2051 B as it moved in front of another star over two years.

The traditional view held that a white dwarf, locked in a binary pairing with another star, sucked matter from its companion, growing ever larger in size until it could no longer support its own weight.

In this theory material from the companion star is accreted onto the white dwarf until its mass reaches a limit, leading to a dramatic explosion.

The Little Ghost (right) is a more classic planetary nebula: Its doughnut is the steadily expanding ring of star gas that has been ionized and set aglow by ultraviolet light from the central white dwarf.

This diagram below is a plot of 22000 stars from the Hipparcos Catalogue together with 1000 low - luminosity stars (red and white dwarfs) from the Gliese Catalogue of Nearby Sstars from the Hipparcos Catalogue together with 1000 low - luminosity stars (red and white dwarfs) from the Gliese Catalogue of Nearby Sstars (red and white dwarfs) from the Gliese Catalogue of Nearby StarsStars.

The detected water most likely came from a minor planet, at least 90 km in diameter but probably much larger, that once orbited the GD 61 star before it became a white dwarf around 200 million years ago.

A Type Ia supernova results from a white dwarf that's part of a binary system (that is, one that shares an orbit with another star) and was about twice the size of our sun during its life.

A white dwarf eventually created from a star that massive has so much heat and pressure inside its core that lighter elements keep fusing into increasingly heavy elements instead of flying off into space.

«Our final image should show us a companion 100 times fainter than any other white dwarf orbiting a neutron star and about 10 times fainter than any known white dwarf, but we don't see a thing,» team member Bart Dunlap, a graduate student from the University of North Carolina at Chapel Hill, said in a statement.

Scientists from a large international collaboration (Oxford, AWE, CEA, LULI, Observatoire de Paris, University of Michigan and University of York) have succeeded for the first time to generate a laboratory analogue of a strong shock that takes place when matter falls at very high speed on the surface of extremely dense stars called white dwarfs.

After the nova burst, gas from the regular star begins to build up again on the white dwarf's surface.

Its mass and diameter are consistent with the theoretical size for a carbon - core white dwarf, one that may have evolved from a 5.05 +0.374 / -0.276 Solar - mass, B - type main - sequence star about 124 + / - 5 million years ago, after 101 to 126 million years as a giant star (Liebert et al, 2005; and Ken Croswell, 2005).

While it's known that Type 1a supernovae form from collapsing white dwarfs — the densest forms of matter after black holes and neutron stars — their formation theories come in two flavors: the single degenerate scenario in which a normal star is consumed by a white dwarf; and the double degenerate scenario in which two white dwarfs merge.

White dwarfs shine simply from the release of the heat left over from when the star was still producing energy from nuclear reactions.

From the original description, the team knew they were looking for a nova eruption — an extremely powerful explosion, where a white dwarf is fed by hydrogen from a nearby sFrom the original description, the team knew they were looking for a nova eruption — an extremely powerful explosion, where a white dwarf is fed by hydrogen from a nearby sfrom a nearby star.

Burning stars balance the inward push of gravity with the outward push from fusion, but in a white dwarf, electrons must squeeze tightly together to create that outward - pressing force.

Building on past observations of the white dwarf called SDSSJ1043 +0855 (the dead core of a star that originally was a few times the mass of the Sun), which has been known to be gobbling up rocky material in its orbit for almost a decade, the team used Keck Observatory's HIRES instrument fitted to the 10 - meter Keck I telescope as well as data from the Hubble Space Telescope to measure and characterize the material being accreted by the star.

In 2003, astronomers announced that they had discovered that iron from supernovae of the first stars (possibly from Type Ia supernovae involving white dwarfs) indicate that «massive chemically enriched galaxies formed» within one billion years after the Big Bang, and so the first stars may have preceded the birth of supermassive black holes (more from Astronomy Picture of the Day, ESA, and Freudling et al, 2003).

While the presence of the calcium - carbonate is still in question, the paper shows strong evidence that the accreted material is almost certainly coming from the outer layers of a planet - like object and that white dwarf stars hold promise in informing on the structure of planets outside of the Solar system.

So that means the white dwarf in this system probably came from a star slightly more massive than the A star that has the debris disk, maybe a B type star.

Based on that distance and the separation between the images of the A star, the M dwarf and the white dwarf, we can estimate that the white dwarf orbits roughly 2200 astronomical units (AU) away from the A star with the disk.