Asteroseismology of the DBV star CBS 114
Chen, Yan-Hui1,2,3; Chen, YH
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2016-08-01
卷号16期号:8页码:120-U24
DOI10.1088/1674-4527/16/8/120
收录类别SCI
关键词Stars: Oscillations (Including Pulsations) Stars: Individual (Cbs 114) White Dwarfs
摘要Asteroseismology is a unique and powerful tool to investigate the internal structure of stars. CBS 114 is the sixth known pulsating DBV star. It was observed by Handler, Metcalfe, & Wood at the South African Astronomical Observatory over three weeks in 2001. Then, it was observed by Metcalfe et al. for seven nights (2004 Feb. 19-25) on the 1.8 m telescope at the Bohyunsan Optical Astronomy Observatory and seven nights (2004 Feb. 21-27) on the 2.1 m telescope at the McDonald Observatory. Totally two triplets, four doublets, and five singlets were identified. The frequency splitting values are very different, from 5.2 Hz to 11.9 mu Hz, which may reflect differential rotations. We evolve grids of white dwarf models by MESA. Cores, added with He/C envelopes, of those white dwarf models are inserted into WDEC to evolve grids of DBV star models. With those DBV star models, we calculate eigenperiods. Those calculated periods are used to fit observed periods. A best-fitting model is selected. The parameters are T-eff = 25 000 K, M-* = 0.740 M-circle dot and log(M-He/M-*) = -4.5. With the relatively large stellar mass, the effective temperature is close to the previous spectroscopic result. In addition, kinetic energy distributions are calculated for the best-fitting model. We find that the observed modes with large frequency splitting values are fitted by the calculated modes with a large amount of kinetic energy distributed in the C/O core. After preliminary analysis, we suggest that the C/O core may rotate at least two times faster than the helium layer for CBS 114.
项目资助者National Natural Science Foundation of China(11563001) ; Research Fund of Chuxiong Normal University(XJGG1501) ; Collaborating Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences(OP201502) ; Yunnan Applied Basic Research Project(2015FD044)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1674-4527
URL查看原文
WOS记录号WOS:000381832700003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]WHITE-DWARF STARS ; THERMONUCLEAR REACTION-RATES ; DIFFUSION ; MODELS ; OSCILLATIONS ; ENVELOPES ; CATALOG ; GD-358
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9720
专题中国科学院天体结构与演化重点实验室
通讯作者Chen, YH
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, Kunming 650011, China
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Chen, Yan-Hui,Chen, YH. Asteroseismology of the DBV star CBS 114[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(8):120-U24.
APA Chen, Yan-Hui,&Chen, YH.(2016).Asteroseismology of the DBV star CBS 114.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(8),120-U24.
MLA Chen, Yan-Hui,et al."Asteroseismology of the DBV star CBS 114".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.8(2016):120-U24.
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