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Peter Paton

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Astronomers Glimpse Exploded Star
by Peter Paton   
Rated "PG" by the Author.
Last edited: Sunday, July 23, 2006
Posted: Sunday, July 23, 2006

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Astronomers Glimpse Exploded Star

Astronomers Glimpse Exploded Star


By Roland Pease
BBC Science

Artist's impression of the explosion of RS Ophiuchi. (Image: David A.Hardy/ & PPARC).
The star is in the equatorial constellation of Ophiuchus (near Libra)
A star on the brink of exploding as a spectacular supernova has been glimpsed by international astronomers.

The star flared up suddenly last February, briefly becoming 1,000 times brighter than normal.

RS Ophiuchi is close to destroying itself in a nuclear explosion called a type 1a supernova, scientists report in the journal Nature.

These are among the brightest phenomena in the Universe, radiating five billion times as much light as the Sun.

They are so bright they can be seen far across the cosmos.

They also seem to be remarkably uniform - they always appear to give off the same amount of light, so that their visibility from Earth, dimmed only by their immense distance, has been used to measure the size of the Universe.

The only problem, which is a great embarrassment to astronomers, is that they have never seen a type 1a close up - their measurements are all based on theory.

They are so rare that the last one known in our galaxy was seen in 1572 by the great Danish astronomer Tycho Brahe, who first coined the term nova, for "new star", not realising he was in fact witnessing the violent end of an unknown star.

Death throes

It has long been believed that type 1a supernovae are the death throes of a white dwarf star. But all modern ones have been so distant that it has not been possible to see what had been there beforehand.

The explosion is so energetic it actually lifts an envelope of material off the surface of the star and throws it off into space

Jeno Sokoloski, Harvard University

RS Ophiuchi, in the equatorial constellation of Ophiuchus (near Libra), is just the right kind of white dwarf.

Several times in the past century it has flared up, as if in a failed supernova explosion. It is as if a thermonuclear flame has swept across the face of the star without quite catching hold.

The last time it flared up was in 1985, when astronomers' technology was not up to catching all the details.

With space-based telescopes and large arrays of radio dishes, this has all changed. Writing in the journal Nature, a team of astronomers said they managed to detect a plume of gaseous material thrown out by the conflagration.

"The explosion is so energetic it actually lifts an envelope of material off the surface of the star and throws it off into space," lead author Jeno Sokoloski, of Harvard University, told the BBC's Science in Action programme.

By tracking the plume, she adds, they could learn more about the star that launched it.

"It started slowing down almost immediately, within just two days, and that tells us the white dwarf must be extremely massive, in fact almost massive enough to collapse."

Critical mass

Theory says that white dwarfs self destruct when their mass equals 1.4 Suns.

RS Oph is nearing that critical mass. It is slowly gobbling up material from a nearby giant star, gaining a millionth of a solar mass every decade.

At the moment, sitting just below the critical mass, the novae on RS Oph blow themselves out, achieving brief episodes of brilliance.

But soon, RS Oph could pass the tipping point - the nuclear flame will detonate from deep inside the star and blow it apart. How soon is not clear.

"It could be tomorrow, but most likely it'll be 1,000, 10,000, 100,000 years from now," says Jeno Sokoloski.

Whenever it happens, it will be, she says, a spectacular event, outshining the planets, so that its final glory will visible against the day time sky.

In the meantime, astronomers will be studying the star closely, to watch its every step towards destruction, and hoping to understand the full details of one of the heaven's great mysteries.

Web Site: Astronomers Glimpse Exploded Star

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Reviewed by - - - - - TRASK 7/23/2006
Peter There Are More Black Holes Out In Universe Than Stars,i.e Never Forget Buddha Said: All Is But An ILLUSION!

When Vastness Of (God) He Stops Thinking (Using His Imagination) All Humanity Is (Sod) Dead...

So Much For Mans Scientific (Explanations) Explorations--Irrespective Glad You Printed Exploding Star-Love Photo...

Reviewed by Rhonda Galizia 7/23/2006
Excellent article, Peter! All of creation is astounding when I think about it...and the more that is revealed, the more astounding it becomes!

Thank you for bringing all sorts of informative and interesting knowledge to us readers!

Love& Prayers, Rhonda
Reviewed by Tinka Boukes 7/23/2006
Wow....fascinating Stuff Peter!!

Love Tinka
Reviewed by Birgit and Roger Pratcher 7/23/2006
Isn't it fascinating? A great article.
Reviewed by m j hollingshead 7/23/2006
I enjoy your informative articles
Reviewed by Mr. Ed 7/23/2006
The explosion is so energetic it actually lifts an envelope of material off the surface of the star and throws it off into space

Truly fascinating material here, Peter.

Reviewed by Elizabeth Parsons 7/23/2006
Absolutely fasinating! Thanks for this wonderful article.
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