YNAO OpenIR  > 中国科学院天体结构与演化重点实验室
Asteroseismology of the DBV star CBS 114
Chen, Yan-Hui1,2,3
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2016-08-01
Volume16Issue:8Pages:120-U24
DOI10.1088/1674-4527/16/8/120
Indexed BySCI
KeywordStars: Oscillations (Including Pulsations) Stars: Individual (Cbs 114) White Dwarfs
Abstract

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.

Funding ProjectNational 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]
Funding OrganizationNational 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]
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
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000381832700003
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordWHITE-DWARF STARS ; THERMONUCLEAR REACTION-RATES ; DIFFUSION ; MODELS ; OSCILLATIONS ; ENVELOPES ; CATALOG ; GD-358
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9720
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorChen, Yan-Hui
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, Kunming 650011, China
Recommended Citation
GB/T 7714
Chen, Yan-Hui. Asteroseismology of the DBV star CBS 114[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(8):120-U24.
APA Chen, Yan-Hui.(2016).Asteroseismology of the DBV star CBS 114.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(8),120-U24.
MLA Chen, Yan-Hui."Asteroseismology of the DBV star CBS 114".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.8(2016):120-U24.
Files in This Item:
File Name/Size DocType Version Access License
Asteroseismology of (185KB)期刊论文出版稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Chen, Yan-Hui]'s Articles
Baidu academic
Similar articles in Baidu academic
[Chen, Yan-Hui]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Chen, Yan-Hui]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Asteroseismology of the DBV star CBS 114.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.