Sentences with phrase «on white dwarf stars»

NEWSPAPER obituaries of Subrahmanyan Chandrasekhar, who died last month aged 84, all highlighted the single achievement for which he will be best remembered — his work on white dwarf stars.

Not exact matches

«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).

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.

Within the next million years or so, all that will remain of these asteroidal bits is a thin metal dusting on top of an innocent - looking white dwarf star.

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 companion star may have dumped its gas on the white dwarf until the added weight sparked a thermonuclear detonation.

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.

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.

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

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.

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.

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.

These are thought to arise when a normal star spills its outer layers of gas on its compact white dwarf partner.

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).

The behavior of a star now depends on its mass, with stars below 0.23 solar masses becoming white dwarfs, while stars with up to 10 solar masses pass through a red giant stage.

My research concentrates on the study of exploding stars — mainly nova outbursts caused by thermonuclear explosions on the surface of white dwarfs in binary star systems.

But contained within these dead stars, called white dwarfs, is the early history of our galaxy, providing clues on how it came to be.

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.

The team based its results on an analysis of 70 of the hottest white dwarfs detectable by Hubble in a small region of the bulge among tens of thousands of 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.

[VIDEO: Cannibal White Dwarf Feeds on Companion Star]

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.

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.

Archival work, of course, isn't exactly what most scientists dream to be doing at NASA, so in 1999 Dr. Livio began shifting his research, focusing on black holes, acceleration of mass, white dwarves, neutron stars and particularly on supernova explosions.

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.»

Just to give an overview of what was in each of the three galleries: a rhino, his shadow, and two black - and - white photographs of dwarves grace the first; a giraffe, some very un-PC photographs of tribal Africans and Western media projections of «jungle people» in the second; and polar bears, a man on fire, more animals, and movie stars with dotted out eyes are in the third.