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Mysterieus raadsel rond rode reuzen wordt steeds groter

Geplaatst op 17-08-2010 om 11u00 door Bert Carrein - 3181 keer gelezen
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Een omvangrijk onderzoek met de Europese Very Large Telescope heeft geen einde kunnen maken aan een raadsel rond sterren zoals onze zon. Integendeel: het mysterie is alleen maar groter geworden. Alle sterren van het kaliber zon zwellen aan het einde van hun bestaan op tot koele, rode reuzensterren.

Zulke sterren vertonen duidelijke, regelmatige helderheidsveranderingen met een periode van enkele jaren. Aangenomen werd dat deze variaties geheel te danken zijn aan het feit dat de ster pulseert, dat wil zeggen: afwisselend opzwelt en samentrekt. In ongeveer één op de drie gevallen vertoont zo'n rode reus echter nog een extra periodieke variatie met een nog iets langere periode.

Om erachter te komen hoe die extra helderheidsvariatie ontstaat, zijn de afgelopen tweeënhalf jaar 58 van die sterren nauwgezet gevolgd. De resultaten van dat onderzoek kunnen echter niet met het pulseren van de sterren in overeenstemming worden gebracht. Ook de mogelijkheid dat de sterren deel uitmaken van dubbelstersystemen wordt uitgesloten geacht.

Maar wat de onverklaarbare variaties ook moge veroorzaken, vaststaat dat ze gepaard gaan met massaverlies: de rode reuzen stoten forse hoeveelheden materie uit.

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

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