Journal
NATURE
Volume 465, Issue 7295, Pages 194-196Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature09045
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Funding
- MCINN
- AGENCIA
- Generalitat de Catalunya
- STFC
- CONICET
- AGAUR of the Generalitat de Catalunya
- STFC [ST/H002391/1, PP/E001149/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H002391/1, PP/E001149/1] Funding Source: researchfish
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NGC 6791 is a well studied open cluster(1) that it is so close to us that can be imaged down to very faint luminosities(2). The main-sequence turn-off age (similar to 8 Gyr) and the age derived from the termination of the white dwarf cooling sequence (similar to 6 Gyr) are very different. One possible explanation is that as white dwarfs cool, one of the ashes of helium burning, (22)Ne, sinks in the deep interior of these stars(3-5). At lower temperatures, white dwarfs are expected to crystallize and phase separation of the main constituents of the core of a typical white dwarf ((12)C and (16)O) is expected to occur(6,7). This sequence of events is expected to introduce long delays in the cooling times(8,9), but has not hitherto been proven. Here we report that, as theoretically anticipated(5,6), physical separation processes occur in the cores of white dwarfs, resolving the age discrepancy for NGC 6791.
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