期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 503, 期 3, 页码 4646-4661出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3751
关键词
convection; stars: evolution; stars: interiors; stars: subdwarfs
资金
- Polish National Science Centre grants [UMO-2017/26/E/ST9/00703, UMO-2017/25/B/ST9/02218]
- Wroclaw Centre for Networking and Supercomputing [265]
The results of evolutionary modelling of subdwarf B stars using new algorithms show that the convective pre-mixing scheme is the preferable one. Both methods are promising alternative methods of studying models of subdwarf B stars.
The results of the evolutionary modelling of subdwarf B stars are presented. For the first time, we explore the core and near-core mixing in subdwarf B stars using new algorithms available in the MESA code: the predictive mixing scheme and the convective pre-mixing scheme. We show how both methods handle problems related to the determination of the convective boundary and the discrepancy between the core masses obtained from asteroseismology and evolutionary models, and long-standing problems related to the core-helium-burning phase, such as the splitting of the convective core and the occurrence of breathing pulses. We find that the convective pre-mixing scheme is the preferable algorithm. The masses of the convective core in the case of the predictive mixing and the combined convective and semiconvective regions in the case of the convective pre-mixing scheme are higher than in the models with only the Ledoux criterion, but they are still lower than the seismic-derived values. Both algorithms are promising and alternative methods of studying models of subdwarf B stars.
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