Application of screened Coulomb potential in fitting DBV star PG 0112+104
Chen, Y. H.1,2,3; Chen, Y. H.(Chuxiong Normal Univ, Inst Astrophys, Chuxiong 675000, Peoples R China)
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-03-01
卷号475期号:1页码:20-26
DOI10.1093/mnras/stx3140
收录类别SCI
关键词Asteroseismology White Dwarfs
摘要With 78.7 d of observations for PG 0112+104, a pulsating DB star, from Campaign 8 of Kepler 2 mission, Hermes et al. made a detailed mode identification. A reliable mode identification, with 5 l = 1 modes, 3 l = 2 modes, and 3 l = 1 or 2 modes, was identified. Grids of DBV star models are evolved by WDEC with element diffusion effect of pure Coulomb potential and screened Coulomb potential. Fitting the identified modes of PG 0112+104 by the calculated ones, we studied the difference of element diffusion effect between adopting pure Coulomb potential and screened Coulomb potential. Our aim is to reduce the fitting error by studying new input physics. The starting models including their chemical composition profile are from white dwarf models evolved by MESA. They were calculated following the stellar evolution from the main sequence to the start of the white dwarf cooling sequences. The optimal parameters are basically consistent with that of previous spectroscopic and asteroseismological studies. The pure and screened Coulomb potential lead to different composition profiles of the C/O-He interface area. High k modes are very sensitive to the area. However, most of the observed modes for PG 0112+104 are low k modes. The sigma(RMS) taking the screened Coulomb potential is reduced by 4 per cent compared with taking the pure Coulomb potential when fitting the identified low k modes of PG 0112+104. Fitting the Kepler 2 data with our models improved the sigma(RMS) of the fit by 27 percent.
项目资助者National Natural Science Foundation of China(11563001) ; Yunnan Applied Basic Research Project(2015FD044) ; Open Research Program of key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences(OP201502) ; Research Fund of Chuxiong Normal University(XJGG1501)
语种英语
学科领域天文学
文章类型Article
ISSN0035-8711
URL查看原文
WOS记录号WOS:000427144200002
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]WHITE-DWARF STARS ; THERMONUCLEAR REACTION-RATES ; BISYSTEM OSCILLATION-THEORY ; INSTABILITY STRIP ; THERMAL-CONDUCTIVITIES ; EVOLUTIONARY MODELS ; ELEMENT DIFFUSION ; DENSE MATTER ; ASTEROSEISMOLOGY ; EC-20058-5234
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12306
专题中国科学院天体结构与演化重点实验室
通讯作者Chen, Y. H.(Chuxiong Normal Univ, Inst Astrophys, Chuxiong 675000, Peoples R China)
作者单位1.Institute of Astrophysics, Chuxiong Normal University, Chuxiong 675000, China
2.School of Physics and Electronical Science, Chuxiong Normal University, Chuxiong 675000,China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, Kunming 650011, China
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Chen, Y. H.,Chen, Y. H.. Application of screened Coulomb potential in fitting DBV star PG 0112+104[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,475(1):20-26.
APA Chen, Y. H.,&Chen, Y. H..(2018).Application of screened Coulomb potential in fitting DBV star PG 0112+104.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,475(1),20-26.
MLA Chen, Y. H.,et al."Application of screened Coulomb potential in fitting DBV star PG 0112+104".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 475.1(2018):20-26.
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