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ESO - European Organisation for Astronomical Research in the Southern Hemisphere Karl-Schwarzschild-Straße 2 85748 Garching bei München, Germany http://www.eso.org
Contact Mr Wolfgang Gieren +56 41 220 3103
Company logo of ESO - European Organisation for Astronomical Research in the Southern Hemisphere
ESO - European Organisation for Astronomical Research in the Southern Hemisphere

Rätsel um pulsierende Sterne gelöst

(PresseBox) (Garching bei München, )
Ein internationales Astronomenteam hat das erste Doppelsternsystem entdeckt, bei dem sich ein pulsierender veränderlicher Stern vom Typ der Cepheiden und sein Begleitstern gegenseitig bedecken. Ein Jahrzehnte altes Rätsel konnte damit gelöst werden, denn es gab zwei miteinander unverträgliche theoretische Vorhersagen für die Massen von Cepheidensternen. Die seltene Konfiguration der Bahnen der beiden Sterne in dem Doppelsternsystem ermöglichte die bisher genaueste Bestimmung der Masse eines Cepheiden. Die neuen Resultate bestätigen nun die Vorhersage aus der Theorie stellarer Pulsationen, während die Abschätzungen aus der Theorie der Sternentwicklung mit den Beobachtungen nicht vereinbar sind.

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