Star twins

While the larger pulsar rotates once every 23 milliseconds, its partner makes just one rotation every 2.8 \r\nseconds - slightly slower than a record on a turntable.\r\n\r\nLyne and his colleagues think that the system was formed by the larger pulsar sucking matter away from a companion star, spinning faster and faster as it did so. The companion then turned into a second, smaller pulsar after a supernova explosion.\r\n\r\nBinaries such as these are thought to emit gravitational waves as the stars circle one another, losing energy until they meet in an intense collision. The end of the pulsars' dance of death is expected in about 85 million years time, and will be marked by one last, enormous burst of gravity waves.\r\n\r\nFour different effects beyond those explained by simple newtonian gravity have already been measured using the binary stars and are consistent with Einstein's theory of gravity.\r\n\r\nThe orientation of the two pulsars means that the radiation from one shines through the magnetic field of the other, giving scientists an unprecedented opportunity to work out what happens in the region immediately around a pulsar. \"In the past we've only been able to guess at things like this,\" says Lyne. \"Now we can actually observe it.\"\r\n\r\nReferences\r\n01. Lyne, A. G. et al. A Double pulsar system - A Rare Laboratory for Relativistic Gravity and Plasma Physics.Science, doi:10.1126/science.1094645 (2004). |Article| \r\n\r\n01. Burgay, M. et al. An increased estimate of the merger rate of double neutron stars from observations of a highly relativistic system. Nature, 426, 531 - 533, doi:10.1038/nature02124 (2004). \r\n\r\nMARK PEPLOW\r\n \r\n", "mainEntityOfPage": { "@type": "WebPage", "@id": "https://ladysilvia.it/en_EU/ladysilvia/1990/science/free/" }, "image": { "@type": "ImageObject", "url": "https://ladysilvia.it/pic/standard/bg/gocce.svg", "height": 14384, "width": 14384 }, "keywords": "pulsars,system,neutron,pulsar,gravitational,smaller,double,observatory", "articleSection": "science", "interactionStatistic": { "@type": "InteractionCounter", "interactionType": { "@type": "ViewAction" }, "userInteractionCount": "167509" }, "mainEntity": { "@type": "WebPage", "@id": "https://ladysilvia.it/en_EU/ladysilvia/1990/science/free/" } }

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