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Latest Stellar evolution Stories

Image 1 - Gamma-ray Burst Reveals Surprising Ingredients Of Early Galaxies
2011-11-02 05:50:51

An international team of astronomers has used the brief but brilliant light of a distant gamma-ray burst as a probe to study the make-up of very distant galaxies. Surprisingly the new observations, made with ESO´s Very Large Telescope, have revealed two galaxies in the young Universe that are richer in the heavier chemical elements than the Sun. The two galaxies may be in the process of merging. Such events in the early Universe will drive the formation of many new stars and may be the...

2011-10-20 04:23:36

Astronomers discover how mysterious stars stay so young Mysterious “blue stragglers” are old stars that appear younger than they should be: they burn hot and blue. Several theories have attempted to explain why they don´t show their age, but, until now, scientists have lacked the crucial observations with which to test each hypothesis. Armed with such observational data, two astronomers from Northwestern University and the University of Wisconsin-Madison report that a...

2011-10-11 09:28:03

Astrophysicists have found evidence of black holes destroying stars, a long-sought phenomenon that provides a new window into general relativity. The research, reported in the latest issue of the Astrophysical Journal, also opens up a method to search for the possible existence of a large population of presently undetectable "intermediate mass" black holes which are hypothesized to be precursors to the super-massive black holes at the centers of most large galaxies. The study was carried...

Survey Hints At Origin Of Type Ia Supernovae
2011-10-08 05:13:10

The largest survey to date of distant exploding stars is giving astronomers new clues to what´s behind the Type Ia supernovae they use to measure distances across the cosmos. These stellar explosions helped astronomers conclude more than a decade ago that dark energy is accelerating the expansion of the universe, and today (Tuesday, Oct. 4) earned the discoverers — including UC Berkeley physicist Saul Perlmutter — the 2011 Nobel Prize in Physics. But what caused them was a...

Image 1 - Astronomers Discover The Fried Egg Nebula
2011-09-28 09:41:23

[ Watch the Video ] University of Manchester astronomers used the European Southern Observatory's Very Large Telescope (VLT) to discover the Fried Egg Nebula. The newly discovered star has a diameter of about a thousand times bigger than the Sun and is about 13,000 light-years away from Earth.  It is the closest hypergiant found so far and shines about 500,000 times brighter than the Sun "This object was known to glow brightly in the infrared but, surprisingly, nobody had...

Image 1 - Herschel Probes Dusty Past Of A Giant Star
2011-09-20 08:52:45

  About 5 thousand million years from now, our Sun will expand into a red giant, swelling to such a size that it may swallow the Earth. It will then begin to shed huge amounts of dust, surrounding itself with an expanding circumstellar envelope (CSE) that ultimately will become a planetary nebula. New insights into this process have been revealed by ESA's Herschel Space Observatory, which is providing unprecedented images of the complex, outer structure of a nearby CSE. As part of...

2011-09-14 06:46:47

High-performance networks speed data on explosion's early discovery A recent discovery by scientists at the Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California, Berkeley, of a supernova within hours of its explosion was made possible by a specialized telescope, state-of-the-art computational tools — and the high-speed data transmissions network of UC San Diego's High-Performance Wireless and Research Education Network (HPWREN), as well as the...

Image 1 - Supernova Reaching Its Peak Brightness Thursday And Friday
2011-09-08 13:19:14

Astronomers will be losing sleep as they wait on a newly discovered supernova to reach its peak in brightness on Thursday and Friday. The exploding star is about 21 million light years away and was first spotted by telescopes August 23. It is the closest of its kind to be seen in four decades and is located in the "Pinwheel Galaxy" above the Big Dipper. Amateur star-gazers could even equip themselves with 20x80 binoculars to help see the exploding star. Astronomers say that the...

White Dwarfs May Need To Slow Down Before Going Supernova
2011-09-07 04:24:24

  Older stars may have to slow down their rotations before exploding as supernovae, according to a new study published earlier this month by scientists at the Harvard-Smithsonian Center for Astrophysics (CfA). In a September 6 press release, the researchers compare the phenomenon to "Speed," a motion picture whose plot revolves around a bus that will explode if it travels too slowly. According to their findings, which have been published in The Astrophysical Journal Letters, the...

2011-09-06 20:35:00

TelescopeKing.com - According to sciencenews.org, on August 24, 2011, astronomers discovered a supernova in progress located in the M101 galaxy. This discovery was unique because the supernova was in its early stages and had been estimated to have begun a mere 12 hours earlier. Secondly, the supernova is very close to earth, relatively speaking. It was predicted that the peak of the explosion would occur in early September, and that prediction seems to be very accurate as the...


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...

7_4b235c0bfbfc8504a41844f9c48ad8962
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...

White Dwarf
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...

6_19859ff34fd03d00777232e2520ce83f5
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...

6_79c799b9f03f60809a9d0aecf38491202
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
barghest
  • A goblin in English folklore, often appearing in the shape of a large dog and believed to portend imminent death or misfortune.
  • A ghost, wraith, hobgoblin, elf, or spirit.
The origin of 'barghest' is not known, but it may be from perhaps burh-ghest, town-ghost, or German Berg-geist (mountain spirit) or Bär-geist (bear-spirit).
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