Sentences with phrase «as white dwarfs»

«You can see bulges in distant galaxies, but you can not resolve the very faint stars, such as the white dwarfs.

As white dwarfs age, they become cooler and fainter, becoming difficult even for sharp - eyed Hubble to detect.

The stellar corpses — highly dense objects known as white dwarfs — were spotted inside a dense cloud of gas and dust known as a planetary nebula.

These eventually disperse and leave behind hot, compact objects known as white dwarfs.

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.

Planets orbiting more compact objects, such as white dwarfs, pulsars and black holes, might have even shorter years since they can get closer in.

It's close enough that researchers could confirm current theories indicating the supernova started out as a white dwarf — a small, collapsed stellar cinder.

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.

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.

A type Ia supernova arises from the explosion of an ultradense stellar remnant known as a white dwarf, but it is less than clear how the white dwarf comes to ignite in a thermonuclear blast.

As a white dwarf draws off hydrogen - rich material from a binary companion over millions of years, Gilfanov says, it experiences a steady process of nuclear fusion on its surface that gives off tremendous amounts of radiation.

Today the central star is of mag 16.6 and a high temperature of some 60,000 K, which will probably cool down as a white dwarf over the coming tens of billions of years.

In most instances, especially among low - mass stars, the distended outer envelope of the star simply drifts off into space, while the core settles down as a white dwarf.

As Vega is so much bigger and hotter than Sol, however, the star will exhaust its core hydrogen after only another 650 million years or so (for a total life of around a billion years) and turn into a red giant or Cepheid variable before puffing away its outer layers to reveal a remnant core as a white dwarf.

The Sun is destined to perish as a white dwarf.

It may be only about 225 to 250 million years old (Liebert et al, 2005; and Ken Croswell, 2005), but being so much bigger and hotter than Sol, the star will exhaust its core hydrogen within only a billion years and turn into a red giant or Cepheid variable before puffing away its outer layers to reveal a remnant core as a white dwarf.

As the white dwarf pulls material from a companion star, the temperature increases, eventually triggering a runaway reaction that detonates in a violent supernova that destroys the white dwarf.

According to current theory, two different mechanisms produce supernovae: First, stars considerably more massive than our Sun can most probably not evolve quietly into an end state as a white dwarf.

As the white dwarf accretes material from the nearby star, it's possible that could explode as a type la supernova.

When that happens, it will be known as a white dwarf, and will remain so for the billions of years it takes to cool down... twinkling in the night sky, hopefully for beings on the other side of the galaxy to admire and make a nightly wish upon.

Not exact matches

I'll use Walt Disney's breakout hit, Snow White and the Seven Dwarves, as an example.

One of the trailers for the kid's movie has been removed, as it shows two of the dwarves spying on Snow White as she undresses.

The GOP will soon be known as the Party of Snow White and The Seven Dwarfs with Sarah «Snow White» Palin leading such GOP Dwarfs as Huckabee, Gingrich, Pawlenty, Thune, DeMint, Romney and Ron Paul.

So, too, do astrophysical exotica such as neutron stars and white dwarfs — the remnants left by normal stars when they die.

At a distance of 5,500 light years, the blue straggler binary appears as a single point of light, but by analyzing the amount of ultraviolet light, the researchers saw the unmistakable signal of a white dwarf.

The researchers found that relatively cool accretion discs around young stars, whose inner edges can be several times the size of the Sun, show the same behaviour as the hot, violent accretion discs around planet - sized white dwarfs, city - sized black holes and supermassive black holes as large as the entire Solar system, supporting the universality of accretion physics.

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.

Patrick Dufour of the University of Montreal in Canada and colleagues have now found a white dwarf with the most contaminated atmosphere yet, suggesting it ate something as big as a dwarf planet.

Brown dwarfs, less massive than stars, are nearly dark, as are collapsed stars — white dwarfs, neutron stars, and black holes.

As relatively small stars (those less than ten times the mass of our sun) near the end of their lives, they throw off their outer layers and become white dwarf stars, which are very dense.

These icy bodies apparently survived the star's evolution as it became a bloated red giant and then collapsed to a small, dense white dwarf.

In this artist's conception, a Ceres - like asteroid is slowly disintegrating as it orbits a white dwarf star.

The results also suggest the presence of unseen, surviving planets which may have perturbed the belt and worked as a «bucket brigade» to draw the icy objects into the white dwarf.

Astronomers think white dwarfs must not be stars so much as the corpses of stars.

The unseen movers are fast - moving white dwarf stars that could account for as much as one - third of the galaxy's dark matter.

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

New theoretical models show that hydrogen in white dwarfs should emit blue light, not red as astronomers once thought.

In addition to sampling cupcakes in flavours such as «red planet» and «white dwarf», visitors tapped their toes to live music and entered a raffle to win bits of meteorite.

We once thought that dark matter might be made up of large objects such as black holes or exotic types of faint stars — neutron stars or white dwarfs — that are nearly invisible to our telescopes.

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.

Invisible dark matter may have started out as hot white dwarfs like this one in the middle of planetary nebula NGC 2440.

When the white dwarf has devoured enough material, it can explode as a nova.

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.

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 Earth.

In strong fields such as those present in the atmospheres of white dwarfs (on the order of 105 teslas) and other stellar objects, our calculations suggest that this mechanism underlies the strong bonding of H2 in the Σ3u + (1σg1σu *) triplet state and of He2 in the Σ1g + (1σg21σu * 2) singlet state, as well as their preferred perpendicular orientation in the external field.

White dwarfs are important to astronomy, and are used as indicators of age in the galaxy, the astronomers said.

But von Hippel, Gilmore and their colleagues used the Hubble Space Telescope, and this allowed them to identify and measure the temperature of white dwarfs as faint as 25th magnitude, which is about 100 million times fainter than any star visible with the naked eye.

Known as 2014J, this was a Type la supernova caused by the explosion of a white dwarf star, the inner core of star once it has run out of nuclear fuel and ejected its outer layers.

In observations obtained at the William Herschel Telescope in the Canary Islands, the University of Warwick astronomers detected a large quantity of hydrogen and oxygen in the atmosphere of a white dwarf (known as SDSS J1242 +5226).