Sentences with phrase «white dwarf stars known»

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.

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.

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.

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.

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.

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.

H1504 +65 is the hottest white dwarf on record — and the only known star lacking helium and hydrogen.

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.

PSR J1713 +0747, as it is known, has a tiny white dwarf companion star, and the two orbit each other exceptionally predictably.

«It tells us that nature has found a way that we didn't know to make white dwarf stars without the usual hydrogen or helium surface layers,» Dufour says.

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.

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).

«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.

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.

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 star.

So far, only about 10 percent of known pulsars are believed to be part of binary systems — most of them orbiting ancient white dwarf stars.

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.

Technically, white dwarfs are no longer «live» stars, but rather the «dead» remains of extinguished stars.

Nominal luminosity class VII (and sometimes higher numerals) is now rarely used for white dwarf or «hot sub-dwarf» classes, since the temperature - letters of the main sequence and giant stars no longer apply to white dwarfs.

The class D (for Degenerate) is the modern classification used for white dwarfs — low - mass stars that are no longer undergoing nuclear fusion and have shrunk to planetary size, slowly cooling down.

This animation shows the explosion of a white dwarf, an extremely dense remnant of a star that can no longer burn nuclear fuel at its core.

A 1997 paper by astronomers (Henry et al) associated with the Research Consortium on Nearby Stars (RECONS) suggests that the sample of stars known to lie within 10 parsecs (32.6 ly) of Earth is «woefully incomplete,» particularly in faint red (M) dwarfs and «white» dwStars (RECONS) suggests that the sample of stars known to lie within 10 parsecs (32.6 ly) of Earth is «woefully incomplete,» particularly in faint red (M) dwarfs and «white» dwstars known to lie within 10 parsecs (32.6 ly) of Earth is «woefully incomplete,» particularly in faint red (M) dwarfs and «white» dwarfs.

New to this disc is the four - minute «In Walt's Words: Snow White and the Seven Dwarfs,» an audio - only interview with Walt Disney discussing the film set to an image track, the seven - minute featurette «Iconography» that explores the film's influences on popular culture, art, and fashion, «@DisneyAnimation: Designing Disney's First Princess» with four contemporary animators discussing the design of Snow White, and an «Alternate Sequence: The Prince Meets Snow White,» plus the breezy promo - style pieces «The Fairest Facts of Them All: 7 Facts You May Now Know About Snow White» with Disney Channel star Sofia Carson and the rap retelling «Snow White in Seventy Seconds.»