Sentences with phrase «forming white dwarfs»

What remains behind is a nearly naked core of carbon and oxygen, which collapses to form a white dwarf star, roughly the size of Earth but 100,000 times as dense.

Not exact matches

At that point, it will partly collapse, blow its outer shells of plasmatic gas into space, turn into a white dwarf, and begin to form a planetary nebula in its surroundings.

A white dwarf is very hot when it is formed, but since it has no source of energy, it will gradually radiate away its energy and cool down.

«The gas which forms the major part of the insterstellar medium,» explains Jorge García Rojas, a researcher at the IAC who is the first author on the paper «can be observed because its atoms are ionized by the photons emitted by the hot stars embedded inside it (which can either very massive stars, or white dwarfs, which are also very hot).

«Asteroid ripped apart to form star's glowing ring system: Research includes first image of ring system orbiting a white dwarf.»

If enough material, mostly in the form of hydrogen gas, accumulates on the surface of the white dwarf, nuclear fusion reactions can occur and intensify, culminating into a cosmic - sized hydrogen bomb blast.

And that pressure, acting on the carbon - rich makeup of the white dwarf, may have crystallized much of it to the particular form of carbon we call diamond.

Theorists know how to calculate the rate at which white dwarfs cool, so the temperature provides a reliable indication of how long ago the star formed.

«I would therefore predict that the masses of the white dwarfs that are being formed in that population right now are going to be about 10 % smaller than the white dwarfs that I measured in the inner halo,» he says.

How such a dense planet formed is unclear, the researchers say, but it's probably the crystalline vestige of a white dwarf star whose atmosphere was stripped away by the parent pulsar.

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.

Even protostars — these are young stars that are just forming and making their own planetary disks and so on — they make very powerful outflows called, the same sort of jets obviously moving at slower speeds, but they are full of plasma, that is flowing out at high speed; white dwarfs, neutron stars, black holes big and small, they seem able to do this task, it really seems to be a very common phenomenon.

Type Ia supernovas are known to form when a white dwarf merges with another star, like a puffed - up red giant (as opposed to Type II supernovas, which form when a single star dies and collapses on itself).

White dwarfs form as the outer layers of a low - mass red giant star puff out to make a planetary nebula.

There is another Barium - dwarf candidate star, Chi1 Orionis or HR 2047 (G0 V), in the same Ursa Major stellar moving group, which suggests that all three stars may have formed a multiple system until their orbital stability was disrupted when the once, brighter and bigger AGB star shed most of an estimated original mass of 2.6 Solar to reveal its white dwarf core about 30 million years ago (Porto de Mello and da Silva, 1997).

These nebulae are formed during the last stages of a star's life when a red giant star casts of its outer layers in a process which leads to the star becoming a white dwarf.

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.

This hypothesis suggests that all three stars may have formed a multiple system until their orbital stability was disrupted when the once, brighter and bigger AGB star (HR 6094 B) shed most of an estimated original mass of 2.6 Solar to reveal its white dwarf core about 30 million years ago (Porto de Mello and da Silva, 1997).

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).

A planetary nebula is a phase of stellar evolution that the sun should experience several billion years from now, when it expands to become a red giant and then sheds most of its outer layers, leaving behind a hot core that contracts to form a dense white dwarf star.

White dwarfs reach this incredible density because they are so collapsed that their electrons are smashed together, forming what is called «degenerate matter.»

Plugged as Disney's final traditionally animated feature film (according to imdb.com), the movie symbolizes an end to the studio's original form of drawing that began with Snow White and the Seven Dwarfs in 1937.

The form was invented by Disney eighty years ago, with «Snow White and the Seven Dwarfs» (1937), a film I still think has never been surpassed, and when you watch something as transporting as «Snow White» — or «Bambi,» or «Toy Story,» or «Beauty and the Beast» — every gesture and background and choreographed flourish, from the facial expressions to the drip - drop of water, flows together with a poetic unity.

He «acts» opposite an obvious, bulb - nosed Snow White, and together they form the show's protagonist / antagonist duo, though they are joined in many of the footage screened in the multi-channel installations by a cast of dwarves (the titular Seven Dwarves of Disney ldwarves (the titular Seven Dwarves of Disney lDwarves of Disney legend).