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Latest Stellar evolution Stories

Bright And Dim Supernovae Teach Us A Lot
2012-11-20 10:13:34

April Flowers for redOrbit.com - Your Universe Online A type of oddly dim exploding star is probably a class of duds, a new study using supercomputer simulations finds, but one that could throw new light on the mysterious nature of dark energy. Thousands of exploding stars are classified as type Ia supernovae, and most of them look similar to each other. This is why astrophysicists use them as accurate cosmic distance indicators, they show that the expansion of the universe is...

Dying Star Caught Coming Back To Life
2012-11-15 14:32:42

Lee Rannals for redOrbit.com - Your Universe Online Astronomers recently found evidence for a dying star coming back to life, giving insight into what may be the fate of our own Solar System in a few billion years. The picture released by the European Space Agency (ESA) is of the planetary nebula Abell 30, located 5,500 light-years away from Earth. A planetary nebula is the often-concentric shells of stellar material cast into space by dying stars. Astronomers in the 18th century...

Aging Stars Sculpt Spectacular Shape Of Planetary Nebula
2012-11-08 14:21:55

[ Video 1 ] | [ Video 2 ] | Video 3 ] Lee Rannals for redOrbit.com - Your Universe Online Astronomers have discovered a pair of stars orbiting each other at the center of a remarkable example of a planetary nebula. The latest find confirms a theory about what controls the spectacular and symmetric appearance of the material flung out into space. Planetary nebulae are glowing shells of gas around white dwarfs, and Fleming 1 is considered a great example that has strikingly...

Star Production In The Universe Is Slowing Down
2012-11-06 13:15:18

Lee Rannals for redOrbit.com - Your Universe Online Astronomers, writing in the journal Monthly Notices of the Royal Astronomical Society, have revealed that the rate of new stars in the Universe is dropping, which is a trend that could continue. The team of astronomers from five different countries said the rate of formation of new stars is now only 1/30th of its peak. The accepted model for evolution of the Universe suggests that stars began to form about 13.4 billion years ago....

New Scenario for the Birth of Type Ia Supernovae
2012-10-26 05:49:37

Lee Rannals for redOrbit.com - Your Universe Online Astronomer J. Craig Wheeler reports in The Astrophysical Journal that he has a new theory on the identity of the "parents" of Type Ia supernovae. Wheeler said that current theories of Type Ia parents do not correctly match up with telescope data on actual supernovae. There are two models today that attempt to explain how Type Ia supernovae are born, the first being "single-degenerate model." In this model, a binary star is made...

New Details Shed Light On Galaxy Evolution
2012-10-22 12:54:34

[WATCH VIDEO: Computer Model Shows a Disk Galaxy´s Life History] Lee Rannals for redOrbit.com — Your Universe Online After a comprehensive study of hundreds of galaxies, astronomers have uncovered a surprising trend in galaxy evolution. The team studied a sample of 544 blue galaxies from the Deep Extragalactic Evolutionary Probe 2 (DEEP2) Redshift Survey, and wrote about their findings in The Astrophysical Journal. "Astronomers thought disk galaxies in the nearby...

Planetary Nebula Survey By Chandra
2012-10-11 05:21:48

April Flowers for redOrbit.com - Your Universe Online An international team of astronomers using NASA's Chandra X-ray Observatory has created a sweeping new survey of dying stars — or planetary nebula — in the neighborhood of the Sun. The resulting X-ray images shed light on the violent "end game" of a Sun-like star's life. Led by Joel Kastner from the Rochester Institute of Technology (RIT), the team won seven days of observation time with Chandra in 2011-2012 to survey and...

Supernova Was Caused By A Yellow Supergiant
2012-09-29 06:47:07

redOrbit Staff & Wire Reports - Your Universe Online A team of Japanese researchers has discovered evidence that a yellow supergiant (YSG) was, in fact, the progenitor for a recently discovered supernova -- a discovery which they say raises serious questions regarding our understanding of the evolution of massive stars. Melina Bersten of the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU) and colleagues analyzed evidence and discovered that supernova...

Supernova Cause Revealed A Millennium Later
2012-09-28 10:32:37

April Flowers for redOrbit.com - Your Universe Online Just over 1,000 years ago, one of the brightest stellar events ever recorded in history occurred. Between April 30 and May 1, 1006, a supernova was widely observed by a number of civilizations across the globe. Now, more than a thousand years later, a research team led by the University of Barcelona, the Instituto de Astrofisica de Canarias (IAC) and the Instituto de Ciencia de Materiales de Madrid (CSIC) has determined that SN 1006 was...


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...

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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...

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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...

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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...

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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
omadhaun
  • A fool; a simpleton: a term of abuse common in Ireland and to a less extent in the Gaelic-speaking parts of Scotland.
This word is partly Irish in origin.