YNAO OpenIR  > 中国科学院天体结构与演化重点实验室
Application of screened Coulomb potential in fitting DBV star PG 0112+104
Chen, Y. H.1,2,3
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-03-01
Volume475Issue:1Pages:20-26
DOI10.1093/mnras/stx3140
Indexed BySCI
KeywordAsteroseismology White Dwarfs
Abstract

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.

Funding ProjectNational 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]
Funding OrganizationNational 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]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000427144200002
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordWHITE-DWARF STARS ; THERMONUCLEAR REACTION-RATES ; BISYSTEM OSCILLATION-THEORY ; INSTABILITY STRIP ; THERMAL-CONDUCTIVITIES ; EVOLUTIONARY MODELS ; ELEMENT DIFFUSION ; DENSE MATTER ; ASTEROSEISMOLOGY ; EC-20058-5234
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12306
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorChen, Y. H.
Affiliation1.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
Recommended Citation
GB/T 7714
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..(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.."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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