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Supernovarest asymmetrisch

Geplaatst op 28-10-2007 om 11u26 door Bert Carrein - 4357 keer gelezen
Nieuws

De supernovarest G292.0+1.8, op twintigduizend lichtjaar afstand van de aarde, is asymmetrisch. Dat blijkt uit een nieuwe rontgenopname die gemaakt is met NASA's Chandra X-ray Observatory. De rontgensatelliet is in totaal zes dagen lang op de verre supernovarest gericht geweest, en heeft onder andere de verdeling van chemische elementen in de uitdijende gasschil vastgelegd. Een supernovarest ontstaat wanneer een zware ster aan het eind van zijn leven explodeert. Daarbij blijft alleen een kleine, compacte neutronenster over. Uit de Chandra-waarnemingen blijkt dat de temperatuur in de supernovarest niet overal gelijk is. Bovendien bevindt de neutronenster zich niet langer exact in het centrum van de expanderende gasschil.

Ook is er een heldere 'band' te zien in het evenaarvlak van de ontplofte ster. Al die waarnemingen doen vermoeden dat de explosie asymmetrisch was, waarbij de resulterende neutronenster een bepaalde reactiesnelheid meekreeg. De equatoriale band doet vermoeden dat de ster in zijn laatste levensfasen vooral in het evenaarvlak veel materie verloor in een krachtige sterrenwind.

astronomie sterrenkunde ruimtevaart nieuws

Bron: http://www.astro-event-group.be

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Tessa Geplaatst op 07-04-2017 om 18u09 - Quote

C'est l'exacte peinture de la politique romaine qui fait l'interet de sa piece, et ce
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siecle. http://www.sophiechassat.com