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Western Carolinian Volume 44 Number 30

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  • APRIL 26, 1979/THE WESTERN CAROLINIAN/PAGE 19 Dying star baffles scientists by ROBERT LOCKE AP Science Writer AP—A mysterious dying star is baffling scientists as it whizzes through the universe—seemingly coming and going at the same time at speeds of at least 40,000 miles per second. "It's like nothing else we've ever seen," said UCLA astronomer Bruce Margon. "Nothing else even comes close." Margon, who has been watching the object for almost a year, outlined the curious puzzle Monday at a Washington, D.C., meeting of the American Physical Society. Details also were made public here. Margon and a team of UCLA scientists discovered the mysterious properties while studying a star called SS-433, which, like our sun and 100 billion others, belongs to the Milky Way galaxy. Initial evidence shows that the object appears to be racing along in two directions. Because SS-433 is about 10,000 light-years from Earth, it is too dim to be seen with the naked eye. A light-year is 5.9 trillion miles. A star's speed and direction are detected by measuring changes—called Doppler shifts—in the wavelength of its light. A blue shift means it is coming toward the observer, a red shift means it is receding. Margon said SS-433 is simultaneously blue-and red-shifted, which means that is is some sort of elongated structure that is rotating like a twirler's baton, with one end moving toward the astronomer's telescopes and the other moving away. Margon said the changes found in SS-433, were "larger by a huge factor than anything we've ever seen in a star." Margon said in an interview earlier that a tentative explanation "is that this is some kind of star that's in some terribly weird kind of trouble." He said the star apparently rotates on a 160-day cycle. As it spins, it is spitting out twin streams of gas, much as a spinning lawn sprinkler shoots water from opposing nozzles. But Margon says that theory, "is just the wildest of guesses at the moment....We really don't know." The sun and other stars move at a comparatively modest 650,000 mph or less, while the blue end of this star is swinging toward Earth at speeds of at least 40,000 miles per second. Its red-shifted end, 16 billion miles across, is pulling away at the same or faster speeds. Margon said if his theory is right, the velocity would seem greatest when one gas jet is aimed directly at Earth and the other is going away from us. The slowest speeds would be measured when the jets were shooting off to the sides. Scientists have no explanation why the gas sems to shot out only in two opposite and roughly equal streams rather than being blown out in all directions. Margon said the ejected gas must be drawn from inside the star, which apparently is dying as it spews its innards around the galaxy. "My guess is that at the center of this whole thing is a neutron star," he said. A neutron star is composed of matter so enormously compressed that a thimblefull would weigh billions of tons. iitfr^'Ty*jJLJ ,(,HtU~A±-4-tlM BlueRibbon Tve got Pabst Blue Ribbon on my mind'' © \979 WBS1 BREWING COMPANY. Milwaukee. Wis, ami ottw ^ n-ev
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