Latest Stellar evolution Stories

Double Star System Detected Using New South African Radio Telescope
2013-05-16 13:22:20

Lee Rannals for redOrbit.com — Your Universe Online Astronomers using the Karoo Array Telescope (KAT-7) in South Africa have revealed giant outbursts from X-ray binary star system Circinus X-1. The team watched as the double star system fired off energetic matter from its core into the surrounding system in extensive, compact jets that flared brightly. Circinus X-1 is a neutron star system where the two stars orbit each other every 16.5 days in an elliptical orbit. When the two...

Black Hole Birth In A Cosmic Flash
2013-05-05 06:07:14

John P. Millis, Ph.D. for redOrbit.com — Your Universe Online Stars sustain themselves by fusing elements in their core, producing even heavier atoms, releasing energy that keeps the immense force of gravity at bay. But eventually, the fusion process will no longer produce enough outward radiation pressure to sustain the star, and it will begin to collapse in on itself. In the grandest of cases, the progenitor is a truly massive object, perhaps tens or hundreds of times the mass...

Hubble Provides Evidence That Galaxies Do Not Confine Starbursts
2013-04-25 08:22:14

WATCH VIDEOS: [Animation of a Starburst Galaxy] | [Probing a Galactic Halo] Lee Rannals for redOrbit.com — Your Universe Online Astronomers writing in The Astrophysical Journal say they've observed how bursts of star formation have a major impact beyond the boundaries of their host galaxy. When galaxies form new stars, they can create frantic episodes of activity known as starbursts. Scientists using the Hubble Space Telescope say these events can affect galactic gas at...

Scientists Unravel The Mysteries Of Large Gamma-Ray Bursts
2013-04-16 13:06:58

WATCH VIDEO: [Swift's Christmas Burst From Blue Supergiant Star Explosion] Lee Rannals for redOrbit.com — Your Universe Online Researchers unwrapped a little more of the mystery surrounding a new type of powerful cosmic explosion, creating a new theory around the death of supergiant stars. These huge explosions create powerful blasts of high energy gamma rays, known as gamma-ray bursts. These larger blasts can last for several hours, compared to most gamma-ray bursts which...

Planetary nebula IC 1295
2013-04-10 05:29:10

[ Watch the Video: Zooming In On The Planetary Nebula IC 1295 ] Lee Rannals for redOrbit.com - Your Universe Online A new image released by the European Space Observatory (ESO) shows the glowing green planetary nebula IC 1295. The new pictures taken by the Very Large Telescope (VLT) shows the nebula surrounding a dim and dying star located about 3300 light-years away in the constellation of Scutum (The Shield). "It has the unusual feature of being surrounded by multiple shells...

Kepler's Supernova Contains Higher Heavy Metal Content Than Our Sun
2013-04-09 14:22:13

Brett Smith for redOrbit.com - Your Universe Online Using observations made from the Suzaku satellite, a joint venture between Japan's space agency and NASA, an international team of researchers has found that the star responsible for Johannes Kepler´s famous supernova contained a much higher heavy metal content that our own sun. After determining the makeup of the distant star, the scientists said they have a greater understanding of Ia supernovae, a useful class of stellar...

Hubble Space Telescope Breaks Record For Furthest Supernova
2013-04-04 12:49:29

ESA/Hubble The NASA/ESA Hubble Space Telescope has broken the record in the quest to find the furthest supernova of the type used to measure cosmic distances. This supernova exploded more than 10 billion years ago (redshift 1.914), at a time the Universe was in its early formative years and stars were being born at a rapid rate. The supernova, designated SN UDS10Wil, belongs to a special class of exploding stars known as Type Ia supernovae. These bright beacons are prized by astronomers...

Astronomers Identify New Type Of Supernova 100 Times More Massive Than Our Sun
2013-03-26 13:30:57

Lee Rannals for redOrbit.com — Your Universe Online Astronomers discovered a new type of supernova of a star about 10 to 100 times more massive than our sun. The Type Iax supernova is a fainter and less energetic explosion than the Type Ia, and may not completely destroy the white dwarf star; type Ia supernovae completely destroy their tiny white dwarfs. "A Type Iax supernova is essentially a mini supernova," says lead author Ryan Foley, Clay Fellow at the Harvard-Smithsonian...

Latest Stellar evolution Reference Libraries

Stellar Astrophysics
2014-01-12 00:00:00

The prominent feature that allows for the existence of life on Earth is the Sun. Radiation from our closest star provides heat and energy to our planet, driving biological processes and providing the necessary conditions for liquid water to naturally exist. But our Sun is only but one star in this vast Universe. And as it turns out, most stars are quite different than the one that illuminates our day. For this reason, scientists have, for hundreds of years, attempted to study the other...

2004-10-19 04:45:43

Hertzsprung-Russell Diagram -- In stellar astronomy, the Hertzsprung-Russell diagram (H-R diagram) shows the relation between the absolute magnitude and the spectral types of stars. It was invented around 1910 by Ejnar Hertzsprung and Henry Norris Russell. There are two equivalent forms. One is the observer's form which plots the color of the star on one axis and the absolute magnitude on the other axis. The theoretician's form plots the temperature of the star on one axis and the...

2004-10-19 04:45:43

White Dwarf -- A white dwarf is a a star supported by electron degeneracy. A star like our Sun will become a white dwarf when it has exhausted its nuclear fuel. Near the end of its nuclear burning stage, such a star goes through a red giant phase and then expels most of its outer material (creating a planetary nebula) until only the hot (T > 100,000 K) core remains, which then settles down to become a young white dwarf. A typical white dwarf is half as massive as the Sun, yet only...

2004-10-19 04:45:42

Supernova Remnant -- A supernova remnant (SNR) is made up of the materials left behind by the gigantic explosion of a star in a supernova. There are two possible routes to this end: either a massive star may cease to generate fusion energy in its core, and collapse inward under the force of its own gravity, or a white dwarf star may accumulate material from a companion star until it reaches a critical mass and undergoes a similar collapse. In either case, the resulting supernova...

2004-10-19 04:45:42

Supernova -- A supernova is a star that increases its brightness drastically within a matter of days, making it appear as if a "new" star was born (hence "nova"). The "super" prefix distinguishes it from a mere nova, which also involves a star increasing in brightness, though to a lesser extent and through a much different mechanism. Astronomers have classified supernovae in several classes, according to the lines of different elements that appear in their spectra. The first...

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Word of the Day
  • A large punch-bowl of the eighteenth century, usually of silver and with a movable rim, and decorated with flutings and a scalloped edge. It was also used for cooling and carrying wine-glasses.
  • A kind of cotton handkerchief having white spots on a colored ground, the spots being produced by a chemical which discharges the color.
This word is possibly named after Monteith (Monteigh), 'an eccentric 17th-century Scotsman who wore a cloak scalloped at the hem.'