期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 469, 期 4, 页码 4718-4725出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx1135
关键词
asteroseismology; stars: evolution; stars: interiors; stars: low-mass
资金
- UK Science and Technology Facilities Council (STFC)
- PRIN INAF [CRA 1.05.01.94.05]
- ERC Consolidator Grant funding scheme (project STARKEY) [615604]
- Portuguese Science Foundation [CIAAUP 03/2016BPD, FIS/04434]
- FEDER through the programme COMPLETE
- Science and Technology Facilities Council [ST/M00077X/1] Funding Source: researchfish
- STFC [ST/M00077X/1] Funding Source: UKRI
Convective mixing in helium-core-burning (HeCB) stars is one of the outstanding issues in stellar modelling. The precise asteroseismic measurements of gravity-mode period spacing (Delta Pi(1)) have opened the door to detailed studies of the near-core structure of such stars, which had not been possible before. Here, we provide stringent tests of various core-mixing scenarios against the largely unbiased population of red-clump stars belonging to the old-open clusters monitored by Kepler, and by coupling the updated precise inference on Delta Pi(1) in thousands of field stars with spectroscopic constraints. We find that models with moderate overshooting successfully reproduce the range observed of Delta Pi(1) in clusters. In particular, we show that there is no evidence for the need to extend the size of the adiabatically stratified core, at least at the beginning of the HeCB phase. This conclusion is based primarily on ensemble studies of Delta Pi(1) as a function of mass and metallicity. While Delta Pi(1) shows no appreciable dependence on the mass, we have found a clear dependence of Delta Pi(1) on metallicity, which is also supported by predictions from models.
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