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Topic: Pulsar


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  Pulsar - MSN Encarta
Pulsars are highly magnetized rotating neutron stars which emit a beam of detectable electromagnetic radiation in the form of radio waves.
Pulsar, sources of powerful, pulsating radio waves in space, believed to be neutron stars—the dense, rapidly spinning remains of burnt-out supergiant stars.
Pulsars emit radiation periodically, that is, at regular intervals, with the time between pulses ranging from about 4 seconds to about 1 millisecond.
encarta.msn.com /encyclopedia_761587624/Pulsar.html   (903 words)

  
  Pulsar - Wikipedia, the free encyclopedia
Pulsars are rotating neutron stars that are observable as sources of electromagnetic radiation.
For example, X-ray pulsars are probably old rotation-powered pulsars that have already lost most of their energy, and have only become visible again after their binary companions expanded and began transferring matter on to the neutron star.
The first radio pulsar, CP 1919 (now known as PSR B1919+21), with a pulse period of 1.339 seconds and a pulse width of 0.04 second, was discovered in 1967 (Nature 217:709-713, 1968).
en.wikipedia.org /wiki/Pulsar   (725 words)

  
 pulsar
Pulsars were found originally at radio wavelengths but have since been observed at optical, X-ray, and gamma-ray energies; the first was discovered in 1967 by Jocelyn Bell Burnell.
The reason for this is that the youngest known pulsar is the one in the Crab pulsar with a period of 33 ms.
Almost all the 90 or so known millisecond pulsars have been found to be part of binary systems in which the partner is a white dwarf, the presumption being that the pulsars was rejuvenated by matter transfer while their companions were still in the red dwarf phase.
www.daviddarling.info /encyclopedia/P/pulsar.html   (481 words)

  
 The Sounds of Pulsars
A pulsar is a highly magnetised neutron star, with a radius of 10-15 km, having somewhat greater mass than the Sun which has a radius of approximately 1 million km.
This pulsar is a typical, normal pulsar, rotating with a period of 0.714519 seconds, i.e.
This is the youngest known pulsar and lies at the centre of the Crab Nebula, the supernova remnant of its birth explosion, which was witnessed by Europeans and Chinese in the year 1054 A.D. as a day-time light in the sky.
www.jb.man.ac.uk /~pulsar/Education/Sounds/sounds.html   (356 words)

  
 Learn more about Pulsar in the online encyclopedia.   (Site not responding. Last check: )
A pulsar, which originally stood for pulsating radio source, is a rapidly rotating neutron star, whose electromagnetic radiation is observed in regularly spaced interval, or pulses.
Pulsars are closely related to magnetars, the main difference being the strength of the object's magnetic field.
Pulsars were discovered by Jocelyn Bell and Antony Hewish in 1967 while they were using a radio array to study the scintillation of quasars.
www.onlineencyclopedia.org /p/pu/pulsar.html   (660 words)

  
 Nissan Pulsar - Wikipedia, the free encyclopedia
The Nissan Pulsar is a small car manufactured by Nissan of Japan and was originally conceived as a front-drive replacement for the company's Nissan Cherry (also known as the Datsun 100A/120A).
The Pulsar was available as a three- or five-door hatchback sedan, a three- or five-door van or station wagon, a three-door fastback coupé with wraparound rear window, and a short-lived four-door fastback sedan.
In 1995, the N15 Pulsar was launched and sold in Europe as the Nissan Almera.
en.wikipedia.org /wiki/Nissan_Pulsar   (1185 words)

  
 Pulsars
A pulsar is a rapidly spinning neutron star that has a mechanism to beam light, much like a lighthouse.
The Crab Nebula (adjacent image) is a strong source of electromagnetic radiation across the spectrum, and most of the power for this emission is being derived from the spinning neutron star and its strong fields lying at the center of the nebula.
The movie imagines that you are close to the Crab Pulsar and slowly pull away, allowing you to see more and more of what is going on to power the inner part of the nebula and to account for the detailed activity seen in the preceding animation (more info).
csep10.phys.utk.edu /astr162/lect/pulsars/pulsars.html   (1153 words)

  
 pulsar planets
The object in question is a millisecond pulsar known as PSR 1257+12.
One possibility is that the pulsar planets formed in the normal way (see planetary systems, formation of) before their host star exploded as a supernova.
The main sequence lifespan of massive stars which are the precursors of pulsars is probably too short to allow any kind of life to develop, even given the availability of suitable planets nearby.
www.daviddarling.info /encyclopedia/P/pulsarplan.html   (464 words)

  
 PULSAR   (Site not responding. Last check: )
Typical pulse periods range from 0.25 to 2 seconds; pulsars with periods in the range of 1 to 10 milliseconds are called millisecond pulsars.
Like the Earth, the pulsar is surrounded by a magnetosphere, a region in which electrons and other particles are accelerated by the magnetic field.
However, the magnetic field of the pulsar is much stronger than the Earth's and the electrons move at velocities close to the speed of light, emitting synchrotron radiation in a narrow beam along the direction of the magnetic poles.
astrosun.tn.cornell.edu /academics/courses/astro201/pulsar.htm   (221 words)

  
 PSR 1913+16
Space-time in the vicinity of the pulsar is greatly warped.
The orbit of the pulsar appears to rotate with time; in the diagram, notice that the orbit is not a closed ellipse, but a continuous elliptical arc whose point of closest approach (periastron) rotates with each orbit.
The rotation of the pulsar's periastron is analogous to the advance of the perihelion of Mercury in its orbit.
astrosun2.astro.cornell.edu /academics/courses/astro201/psr1913.htm   (1149 words)

  
 Princeton Pulsar Group: Pulsar Multimedia   (Site not responding. Last check: )
Pulsar radio signals sound like broadband, pulsed noise if the received signal is detected and fed to a speaker.
PSR 0329+54 is among the strongest known pulsars, and was one of the first discovered.
PSR 1937+21 is the the fastest known pulsar, and was the first millisecond pulsar discovered.
pulsar.princeton.edu /pulsar/multimedia.shtml   (194 words)

  
 Pulsar [www.progweed.net]
Pulsar was a French progressive rock group that rose to prominence in the late-70s, and like many of their French contemporaries were exceedingly dark, though with a more atmospheric bent and a profound sadness at the core of nearly all their work.
Pulsar's music was generally characterized by extended suites with a weighing atmosphere and a Pink Floyd-ish sense of grandeur and mood.
Pulsar sits squarely within the symphonic progressive rock movement, and their fascination with dark atmospheres mixed with symphonic tendencies makes for a sound which I feel is actually quite unique.
www.progweed.net /reviews/pulsar/pulsar-band.html   (1418 words)

  
 Universe Today - Pulsar is Even Denser Than Prevously Thought
An international team of astronomers used Chandra to measure the pulsar at the centre of nebula 3C58, which is the remnant from a supernova that exploded in 1181.
Pulsars are formed when the central core of a massive star collapses to create a dense object about 15 miles across that is composed almost entirely of neutrons.
Surrounding the pulsar is a bright doughnut-shaped, or toroidal, structure, with jet-like features extending in a perpendicular direction away from the torus.
www.universetoday.com /am/publish/pulsar_ultra_dense.html?14122004   (807 words)

  
 Pulsar   (Site not responding. Last check: )
Pulsar, the hero, had a clear chest with realistic internal organs, much like the Visible Man model.
Pulsar also came with a pair of Mission Disks that you could insert into his computer brain which was hidden behind his removable face.
The center was essentially a wall which allowed you to strap in Pulsar and light scan his brain, activate vital organs and program him for missions.
www.bigredtoybox.com /cgi-bin/toynfo.pl?pulsarindex   (201 words)

  
 NASA - Top Story - EINSTEIN'S GRAVITATIONAL WAVES MAY SET SPEED LIMIT FOR PULSAR SPIN - July 2, 2003
Material flowing onto the pulsar surface from its companion star tends to quicken the spin, but loss of energy released as gravitational radiation tends to slow the spin due to the principle of conservation of energy.
Pulsars, the fastest spinning stars in the Universe, are the core remains of exploded stars, containing the mass of our Sun compressed into a sphere about 10 miles across.
Pulsar break-up is predicted to occur at 1,000 to 3,000 revolutions per second.
www.nasa.gov /centers/goddard/news/topstory/2003/0702pulsarspeed.html   (1265 words)

  
 Pulsar Tutorial
In fact, the key to a pulsar is the combination of the extraordinary magnetic field and the rotation of a neutron star.
The center image portrays the pulsar "flash" as it would be seen from Earth given the pulsar's head-on orientation.
A pulsar may be seen in gamma rays, X-rays, visible light, radio waves or other bands of radiation.
science.nasa.gov /newhome/help/tutorials/pulsar.htm   (710 words)

  
 Reference.com/Encyclopedia/Millisecond pulsar
A millisecond pulsar (MSP), often referred to as "recycled pulsar", is a pulsar with a rotational period in the range of about 1-10 milliseconds.
Many millisecond pulsars are found in globular clusters because the extremely high stellar density of these systems leads to exchange interactions that create the kind of mass-transfer binaries that spin pulsars up to millisecond pulsars.
The first millisecond pulsar, PSR B1937+21, was discovered in 1982 by Backer et al.
www.reference.com /browse/wiki/Millisecond_pulsar   (428 words)

  
 Pulsars
The "pulses" of high-energy radiation we see from a pulsar are due to a misalignment of the neutron star's rotation axis and its magnetic axis.
Pulsars accelerate particles to tremendous energies in their "magnetospheres", the name for the region which is dominated by the neutron star's incredibly strong magnetic field.
Pulsars seen this way, whether in the radio, optical, X-ray, or gamma-ray, are often referred to as "spin-powered pulsars," because the ultimate source of energy comes from the gradual slowing down of the neutron star rotation.
imagine.gsfc.nasa.gov /docs/science/know_l2/pulsars.html   (1039 words)

  
 Astronomers Discover Fastest-Spinning Pulsar
Pulsars are spinning neutron stars that sling "lighthouse beams" of radio waves or light around as they spin.
The newly-discovered pulsar is spinning 716 times per second, or at 716 Hertz (Hz), readily beating the previous record of 642 Hz from a pulsar discovered in 1982.
The pulsar research also was supported by the Canada Foundation for Innovation, the Natural Sciences and Engineering Research Council of Canada, the Quebec Foundation for Research on Nature and Technology, the Canadian Institute for Advanced Research, the Canada Research Chairs Program, and the National Science Foundation..
www.nrao.edu /pr/2006/mspulsar   (940 words)

  
 Pulsar - Memory Alpha, the Star Trek Wiki
A pulsar is a type of star, a rapidly rotating neutron star that sends out streams of electrons at nearly the speed of light along their magnetic poles.
The USS Enterprise-D conducted an astronomical survey of a new pulsar cluster in the Epsilon IX sector in 2365.
However, it was located near an inhabited star system, and so she was unable to explore it due to the general xenophobia amongst the Varro.
memory-alpha.org /en/wiki/Pulsar   (371 words)

  
 Neutron Stars and Pulsars - Introduction
Pulsars were first discovered in late 1967 by graduate student Jocelyn Bell Burnell as radio sources that blink on and off at a constant frequency.
Pulsars are spinning neutron stars that have jets of particles moving almost at the speed of light streaming out above their magnetic poles.
Neutron stars for which we see such pulses are called "pulsars", or sometimes "spin-powered pulsars," indicating that the source of energy is the rotation of the neutron star.
imagine.gsfc.nasa.gov /docs/science/know_l1/pulsars.html   (747 words)

  
 Spaceflight Now | Breaking News | Youngest pulsar found in heart of exploded star
This pulsar, in the supernova remnant Kes 75, is about 300 years younger than the second-youngest pulsar, the Crab, which scientists have long considered to be the archetypal young pulsar.
The pulsar's age is 700 years, consistent with the age of the supernova remnant that houses it.
Young pulsars are prone to starquakes, which changes the spin rate and reveals clues to their internal structure.
spaceflightnow.com /news/n0008/11yngpulsar   (1130 words)

  
 Pulsar Timing
Pulsars are intrinsically interesting and exotic objects, but much of the best science based on pulsar observations has come from their use as tools via pulsar timing.
Pulsar timing is the regular monitoring of the rotation of the neutron star by tracking (nearly exactly) the times of arrival (TOAs) of the radio pulses.
For binary pulsars, the pulsar Roemer delays comprise up to five Keplerian parameters: the projected semi-major axis $x\equiv a_1\sin i/c$, the longitude of periastron $\omega$, the time of periastron passage $T_0$, the orbital period $P_b$, and the orbital eccentricity $e$.
www.cv.nrao.edu /course/astr534/PulsarTiming.html   (967 words)

  
 Radio Control Car Action: LRP Pulsar competition
The Pulsar Competition is LRP's first charger to be released in America, but it has already proven itself as the choice of world champions; Surikarn Chaidajsuriya and Matt Francis had Pulsars on their benches when they won their respective IFMAR ISTC and 2WD Off-road World Championships.
The Pulsar has you covered with its auto-restart function; if the Pulsar loses power, it will automatically begin charging without resetting any data once power has been restored (it also sounds an alarm to let you know the power is out).
Though the Pulsar did seem to give a little boost to all the packs I charged, not all saw extended run times; your results will vary with the types of packs you use and their condition.
www.findarticles.com /p/articles/mi_qa3825/is_200301/ai_n9200003   (1462 words)

  
 Original Pulsar Watch Newsletter
The Pulsar, being the first, and thereby, one of the most expensive, has endured and has held the interest of their owners throughout the years.
Unfortunately, the affection the Pulsar and related models have retained with their owners has outlasted most of the parts available for their repair.
Pulsar wearers may substitute the Everready 357 by utilizing a spacer in the battery pocket to keep the cell centered.
www.parsecent.com /pulsletterpage.html   (1010 words)

  
 Astronomers weigh 'recycled' millisecond pulsar
As a pulsar spins, it emits beams of radio waves that sweep through space like a lighthouse beacon; astronomers use radio telescopes to observe the apparent blinking of the pulsar and precisely measure the time when its pulses arrive at the earth.
Mildly-recycled pulsars, spinning a few tens of times per second and thought to have accreted a relatively small amount of matter from a companion, are between 1.31 and 1.44 times the mass of the sun; reassuringly, none are more massive than PSR J1909-3744 which should have accreted more material from its companion.
If this is the case, then the pulsar recycling process must be messy: more than half a solar mass must have been lost from the companion as a wind of ejected gas as it evolved from a normal main sequence star to a white dwarf.
www.physorg.com /news9837.html   (931 words)

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