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Topic: Runaway star

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In the News (Tue 19 Mar 19)

  Academy Resources: Star Classifications   (Site not responding. Last check: 2007-11-02)
A star is a body massive enough to trigger nuclear reactions at its core.
The reactive force of the explosion and the star’s self-gravitation eject shell electrons (as in a white dwarf) and nuclear positrons.
While a 'Giant' star may have a radius of up to 1,000 times that of Sol and be up to 100,000 times as luminous, most of the stars are in the 'main sequence' portion of their lifetimes and have values near the typical main sequence ones for their type.
www.starbase118.net /academy/library/science/stars.htm   (666 words)

 Runaway star - Wikipedia, the free encyclopedia
A runaway star is one which is moving through space with an abnormally high velocity compared to other stars around it.
In the second scenario, a supernova explosion in a multiple star system can result in the remaining components moving away at high speed.
One example of a related set of runaway stars is the case of AE Aurigae, 53 Arietis and Mu Columbae, all of which are moving away from each other at velocities of over 100km/s (for comparison, the Sun moves through the galaxy at about 20km/s).
en.wikipedia.org /wiki/Runaway_star   (242 words)

 APOD: December 3, 1997 - Runaway Star   (Site not responding. Last check: 2007-11-02)
Runaway stars are massive stars traveling rapidly through interstellar space.
Like a ship plowing through the interstellar medium, runaway star HD 77581 has produced this graceful arcing bow wave or "bow shock" - compressing the gaseous material in its path.
A clue to the answer may lie in its optically invisible companion star, an X-ray bright pulsar known as Vela X-1.
antwrp.gsfc.nasa.gov /apod/ap971203.html   (150 words)

 sciforums.com - Streaking neutron star
No, it's a runaway neutron star, called RX J185635-3754, forged in a stellar explosion that would have been visible to our distant ancestors in 1 million B.C. Precise observations made with NASA's Hubble telescope confirm that the interstellar interloper turns out to be the closest neutron star ever seen.
In addition, the observations reveal that the neutron star is streaking across the sky from west to east at a rate of 1/3 of an arc second per year.
Because 1 million years ago the neutron star and Zeta Ophiuchus were in about the same location in space, the neutron star may be the remnant of the original binary companion of Zeta Ophiuchus, the star which exploded.
www.sciforums.com /showthread.php?p=28   (780 words)

 Star Clusters
Stars lighter than those of spectral types O and B are also formed from the same cloud of gas, and reside in the same region of space.
The formation of low-mass stars like the Sun can be explained by the gravitational collapse of a molecular cloud fragment into a protostellar core and the subsequent accretion of gas and dust from the surrounding interstellar medium.
Stars in these clusters that are 600 million years old are just now exhausting their central hydrogen fuel, indicating that M82 brightening occurred just that long ago.
universe-review.ca /F06-star-cluster.htm   (2480 words)

 Great Moments in Science - Runaway Stars
For its primary goal, Hipparcos was supposed to measure the positions of the stars accurate to one millisecond of arc.
So almost certainly, one million years ago, one of the two stars in a binary pair exploded in a supernova and turned into the neutron star PSR J1932+1059, and that colossal explosion booted zeta-Ophiuchi off into space as a solitary Runaway Star.
But so far two-thirds of the Runaway Stars seem to be created by one star exploding in a supernova, and one-third involve close encounters between two sets of binaries.
www.abc.net.au /science/k2/moments/s223732.htm   (841 words)

 Barnard's Star
The star was named after its discoverer, noted astronomer Edward Emerson Barnard (1857-1923), who found in 1916 that the star has the largest known proper motion of all known stars (10.3 arcseconds per year).
Its high space motion and sub-Solar metallicity suggests that the star is "intermediate Population II star," somewhere between a Halo and a disk star (K├╝rster et al, 2003; and John E.
While the star may be as much as 11 or 12 billion years old (Ken Croswell, 2005), it may last another another 40 billion years or more before cooling into a fl dwarf.
www.solstation.com /stars/barnards.htm   (1316 words)

When a star's direction of motion in space is known, it is possible to reconstruct its previous path and, even more interestingly, to find the place where the star originally came from.
For instance, an OB star with a mass of 25 times that of the Sun, will explode after only 10 million years, compared to an expected life-time of about 13,000 million years for the Sun (which is not an OB star and will not become a supernova).
Blaauw suggested that when an OB star is bound to another OB star in a binary system (a `double star'), the supernova explosion of one of the stars (the heaviest of the two would explode first) results in the rapid acceleration (in astronomical terminology, a `kick') of the other one.
www.eso.org /outreach/press-rel/pr-1997/pr-01-97.html   (1817 words)

 runaway star
A young star, usually of spectral type O or early B, with an unusually high space velocity.
The best known are Naos (Zeta Puppis), and the trio AE Aurigae, 53 Arietis, and Mu Columbae, all of which are racing away on diverging paths from a comparatively small region in Orion.
Runaway stars are thought to be produced when there is a supernova explosion in a close binary system –; an idea proposed in 1961 by the Dutch astronomer Adriaan Blaauw.
www.daviddarling.info /encyclopedia/R/runawaystar.html   (194 words)

 Hubble sees lone neutron star streaking across galaxy   (Site not responding. Last check: 2007-11-02)
A neutron star is the remnants left behind after a supernova explosion, as the material at the core collapses into a dense mass of neutrons.
In addition, the images reveal that the neutron star is streaking across the sky from west to east at a rate equal to the diameter of the Moon every 5,400 years.
Because the neutron star and Zeta Ophiuchus were in about the same location in space, RX J185635-3754 may be the remnant of the original binary companion of Zeta Ophiuchus.
www.hypography.com /article.cfm?id=28191   (848 words)

 O Star Atlas   (Site not responding. Last check: 2007-11-02)
Visual binary and multiple stars are clearly much more common among association and cluster stars than among field stars (and are totally absent among the runaways; indeed the runaway stars may serve admirably for observations requiring single star calibration sources).
These results are generally consistent with the expectation that the runaway stars and some of the field stars were ejected from their birthplaces in clusters by processes which tend to disrupt binaries.
Subsequent perturbations from cluster stars cause a decrease in the semimajor axis of the double binary and an increase in eccentricity.
ad.usno.navy.mil /wds/dsl/Ostars/ostars.html   (7358 words)

 USATODAY.com - Runaway star collisions create black holes   (Site not responding. Last check: 2007-11-02)
Star collisions are thought to be rare in the universe, but other studies have found evidence they do occur in clusters.
Massive stars tend to sink toward the center of the cluster, where it is most crowded, Portegies Zwart said.
The most massive stars are also the biggest, increasing their odds of a collision.
www.usatoday.com /tech/news/2004-04-15-star-collisions_x.htm   (990 words)

 BBC NEWS | Science/Nature | Lone neutron star speeds through space
Astronomers have identified a runaway neutron star that is hurtling in our direction at more than 100 times the speed of a supersonic jet.
Neutron stars are small, extremely dense, rapidly rotating spheres of neutrons that are created when some of the biggest stars in the Universe explode at the end of their fuel-burning lives.
This neutron star may be moving away from a grouping of young stars in the constellation Scorpius.
news.bbc.co.uk /1/hi/sci/tech/1017133.stm   (492 words)

 News in Science - Runaway star voted off the island - 15/11/2005
The star, HE 0437-5439, was found on a star survey and initially led its discoverers to suspect their instruments were out of whack.
The light from the star was the wrong colour, or wavelength, for where the star was located.
Napiwotzki's first thought, after confirming the star's spectral information with the European Southern Observatory's Very Large Telescope in Chile, was that the star had been slingshot out of the core of the Milky Way after a close call with the giant fl hole there.
www.abc.net.au /science/news/stories/s1506900.htm   (521 words)

 10.27.2004 - Stellar survivor from 1572 A.D. explosion supports supernova theory
The star is breaking the speed limit for that particular region of the Milky Way Galaxy by moving three times faster than the surrounding stars.
The runaway star may have buried the chemical evidence of its deceased companion deep inside.
Tycho Brahe first noticed the star on Nov. 11, 1572, in the constellation Cassiopeia, where it shone as bright as the planet Jupiter, which was in the night sky in Pisces.
www.berkeley.edu /news/media/releases/2004/10/27_Tycho.shtml   (1424 words)

 New Scientist Breaking News - Runaway stars may solve black hole riddle
If a runaway star accumulates between 800 and 3000 times the Sun's mass before exploding as a supernova, it can produce a midsize fl hole whose mass is 100 to 1000 times the Sun's.
But the star cluster has to be very dense and very young - about 10 million years old - to allow this to happen, say the researchers.
They found that massive stars in MGG 11 - home to the midsize fl hole candidate - reached the centre of the cluster in three million years, while those in the other cluster took 15 million years.
www.newscientist.com /article.ns?id=dn4885   (662 words)

 ScienceDaily: Hubble Sees Bare Neutron Star Streaking Across Space
The Case Of The Neutron Star With A Wayward Wake (June 1, 2006) -- A long observation with NASA's Chandra X-ray Observatory revealed important new details of a neutron star that is spewing out a wake of high-energy particles as it races through space.
Neutron Star Discovered Where A Black Hole Was Expected (November 3, 2005) -- A very massive star collapsed to form a neutron star and not a fl hole as expected, according to new results from NASA's Chandra X-ray Observatory.
Star cluster -- Star clusters are groups of stars which are gravitationally bound.
www.sciencedaily.com /releases/2000/11/001113071852.htm   (2076 words)

 ESA - Science - Science News Release
The star is noticeably offset from the geometric centre of the bubble.
The runaway star and its surroundings have been studied with a variety of telescopes for the past seven years.
On 11 November 1572, Tycho Brahe noticed a star in the constellation Cassiopeia that was as bright as the planet Jupiter (which was in the night sky in Pisces).
www.esa.int /esaSC/Pr_25_2004_s_en.html   (1627 words)

 7 Discussion   (Site not responding. Last check: 2007-11-02)
The most efficient encounter is that between two close binaries in a stellar association or open cluster, which in most cases results in the ejection of two runaway stars and one eccentric binary (Hoffer 1983; Mikkola 1983).
Our programme stars are too far away and their space motions are therefore not known accurately enough to allow to identify their relation to a young cluster or association in the galactic plane.
Four stars in our sample have been proposed in the literature as candidates for B-type stars formed in the galactic halo because their times-of-flight were found to be considerably larer than the evolutionary time scales (Conlon et al.
aanda.u-strasbg.fr:2002 /papers/aa/full/2001/42/aa1632/node7.html   (819 words)

 Discovery Channel :: News :: Mysterious Runaway Star Stymies Scientist   (Site not responding. Last check: 2007-11-02)
Napiwotzki's first thought, after confirming the star's spectral information with the European Southern Observatory's (ESO) Very Large Telescope in Chile, was that the star had been slingshot out of the core of the Milky Way after a close call with the giant fl hole there.
That means something even more unusual might have thrown the star towards the Milky Way, something like a sideways blast by a much bigger companion star that exploded as a supernova, he said.
To confirm this, however, will require a lot more information on the runaway star's trajectory, he said, and that could take many years of observing the star as it moves.
dsc.discovery.com /news/briefs/20051114/star_spa.html   (441 words)

 01.09.2002 - Astronomers try to catch runaway star
The star, which goes by the name SGR1900+14, is located in the constellation of Aquila about 20,000 light-years away.
It is an example of an intensely magnetic star, known as a magnetar, which is thought to arise from a fairly recent supernova explosion.
Although many stars have come to an end in supernova explosions over the eons, in most cases the result is a dense object known as a neutron star, which has about the same diameter as the Washington D.C. beltway, but contains as much matter as the sun.
www.berkeley.edu /news/media/releases/2002/01/09_magne.html   (968 words)

 JS Online:'Runaway' star racing from Milky Way
The runaway is a blue star about three times as massive as the sun in the constellation Hydra.
The star already is some 196,000 light-years from the center of the Milky Way, much farther out than the sun, which at 30,000 light-years from the center is already in the suburbs.
The outcast star's trail, the astronomers say, leads straight back to the center of the galaxy, where, astronomers have long suspected, there dwells a giant fl hole, several million solar masses worth of gravitational oblivion, gobbling all that comes its way.
www.jsonline.com /story/index.aspx?id=305087&format=print   (227 words)

 runaway star concept from the Astronomy knowledge base   (Site not responding. Last check: 2007-11-02)
Runaway stars are thought to be produced when there is a supernova explosion in a close binary system.
AE Aurigae (6 facts) - Runaway star which diverges from a comparatively small area in Orion.
Mu Columbae (3 facts) - Runaway star which diverges from a comparatively small area in Orion.
www.site.uottawa.ca:4321 /astronomy/runawaystar.html   (234 words)

 Abnormal Star Behavior
Astronomers are amazed at the discovery of what appears to be a runaway star that is racing from the far regions of space into our galaxy at an incredible speed of 1.6 billion miles an hour.
But HE 0437-5439 is a young star on the outside rushing inward through the oldest star systems in the galaxy, leading astronomers to believe it originated in some other part of the universe and was spewed off into our direction by some unknown force.
Thus a runaway star like HE 0437-5439 could be something of special interest not only to the astronomers, but to all people interested in occult matters.
perdurabo10.tripod.com /id1625.html   (447 words)

 Curriculum Vita
Runaway OB stars are massive stars with anomalously high peculiar velocities (v_pec>30 km/sec).
Runaway OB stars are thought to be formed in two ways: cluster ejection of a member of an OB association through 3 and 4 body interactions (Leonard and Duncan 1988, 1990), or a supernova explosion in a massive binary system that leaves the surviving OB secondary with a recoil runaway velocity (Blaauw 1961).
We were quite successful in generating a population of runaway OB stars that matched the observed Galactic population in both average velocity and in the fraction of O and B stars that are runaway.
www.termanweb.net /cv.html   (2274 words)

 The Other Side of Toho
The story follows the attempts of the students, along with their university professor, to find and study the beast, the creature's effect on the small native village near the cave where it lives (the natives worship it as a God), and the attempts of a circus impresario to capture it.
Starring Toshiro Mifune and directed by Hiroshi Inagaki, this epic production, regarded as Japan's equivalent to The Ten Commandments, is highlighted by a good story and exceptional special effects from Eiji Tsuburaya's spfx unit (the stop-all being when Mifune's character battles a seven-headed dragon in the film's second act).
Produced by Tanaka and directed by Honda from a screenplay by Takeshi Kimura, the story concerns the attempts of the nations of Earth to move the planet from the path of the approaching star by means of rockets installed at the South Pole.
www.historyvortex.org /OtherSideToho.html   (2372 words)

 Astronomy - High-speed star flees Tycho's blast - Francis Reddy
A runaway sun in Tycho's supernova remnant is likely a surviving companion of the exploded star — and probably triggered the blast.
The star is racing at nearly 304,000 mph (490,000 km/h) through the remnant of Tycho's supernova, which is named for the 16th-century Danish observer who recorded its brightness changes in unprecedented detail.
When I had satisfied myself that no star of that kind had ever shone forth before, I was led into such perplexity by the unbelievability of the thing that I began to doubt the faith of my own eyes.
www.astronomy.com /asy/default.aspx?c=a&id=2571   (907 words)

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