Asteroseismic modelling of the subgiant mu Herculis using SONG data: lifting the degeneracy between age and model input parameters

doi:10.1093/mnras/sty3000

CORC > 国家天文台 > 中国科学院国家天文台

	Asteroseismic modelling of the subgiant mu Herculis using SONG data: lifting the degeneracy between age and model input parameters
	Li, Tanda 1,2,3; Bedding, Timothy R.1,2; Kjeldsen, Hans 2; Stello, Dennis 2,4; Christensen-Dalsgaard, Jorgen 2; Deng, Licai 5
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-02-01
卷号	483 期号:1 页码:780-789
关键词	stars: evolution stars: interiors stars: oscillations
ISSN号	0035-8711
DOI	10.1093/mnras/sty3000
英文摘要	We model the oscillations of the SONG target mu Herculis to estimate the parameters of the star. The l = 1 mixed modes of mu Her provide strong constraints on stellar properties. The mass and age given by our asteroseismic modelling are 1.10(-0.06)(+0.11) M-circle dot and 7.55(-0.79)(+0.96) Gyr, respectively. The initial helium abundance is also constrained at around Y-init = 0.28, suggesting a ratio in the elements enrichment law (Delta Y/Delta Z) around 1.3, which is closed to the solar value. The mixing-length parameter converges to about 1.7, which is similar to 10 per cent lower than the solar value and consistent with the results from hydrodynamic simulations. Our estimates of stellar mass and age agree very well with the previous modelling results with different input physics. Adding asteroseismic information makes these determinations less model dependent than is typically the case when only surface information is available. Our studies of the model dependence (mass, initial helium and metallicity fractions, and the mixing-length parameter) of the age determination indicate that accurate stellar ages (less than or similar to 10 per cent) can be expected from asteroseismic modelling for stars similar to mu Her. The l = 1 bumped modes, which are sensitive to the mean density of the helium core, provide a useful 'clock' that provides additional constraints on its age.
资助项目	Australian Research Council DP grant[DP150104667] ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council[267864] ; Independent Research Fund Denmark's Sapere Aude program[DFF-5051-00130] ; National Natural Science Foundation of China[11503039] ; National Natural Science Foundation of China[11427901] ; National Natural Science Foundation of China[11273007] ; National Natural Science Foundation of China[10933002] ; Danish National Research Foundation[DNRF106]
WOS关键词	SOLAR-LIKE OSCILLATIONS ; DIFFUSION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000462251000053
资助机构	Australian Research Council DP grant ; Australian Research Council DP grant ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council ; Independent Research Fund Denmark's Sapere Aude program ; Independent Research Fund Denmark's Sapere Aude program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Danish National Research Foundation ; Danish National Research Foundation ; Australian Research Council DP grant ; Australian Research Council DP grant ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council ; Independent Research Fund Denmark's Sapere Aude program ; Independent Research Fund Denmark's Sapere Aude program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Danish National Research Foundation ; Danish National Research Foundation ; Australian Research Council DP grant ; Australian Research Council DP grant ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council ; Independent Research Fund Denmark's Sapere Aude program ; Independent Research Fund Denmark's Sapere Aude program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Danish National Research Foundation ; Danish National Research Foundation ; Australian Research Council DP grant ; Australian Research Council DP grant ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council ; ASTERISK project (ASTERoseismic Investigations with SONG) - European Research Council ; Independent Research Fund Denmark's Sapere Aude program ; Independent Research Fund Denmark's Sapere Aude program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Danish National Research Foundation ; Danish National Research Foundation
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/25729]
专题	中国科学院国家天文台
通讯作者	Li, Tanda; Bedding, Timothy R.
作者单位	1.Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia 2.Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 3.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China 4.Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia 5.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Li, Tanda,Bedding, Timothy R.,Kjeldsen, Hans,et al. Asteroseismic modelling of the subgiant mu Herculis using SONG data: lifting the degeneracy between age and model input parameters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,483(1):780-789.
APA	Li, Tanda,Bedding, Timothy R.,Kjeldsen, Hans,Stello, Dennis,Christensen-Dalsgaard, Jorgen,&Deng, Licai.(2019).Asteroseismic modelling of the subgiant mu Herculis using SONG data: lifting the degeneracy between age and model input parameters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,483(1),780-789.
MLA	Li, Tanda,et al."Asteroseismic modelling of the subgiant mu Herculis using SONG data: lifting the degeneracy between age and model input parameters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 483.1(2019):780-789.