Asteroseismology of the DAV Star L19-2
Chen, Yanhui1,2,3
发表期刊ASTROPHYSICAL JOURNAL
2022-07-01
卷号934期号:1
DOI10.3847/1538-4357/ac76bd
收录类别SCI
摘要

L19-2 is a DAV star, which was intermittently observed from 1976 to 2013. Five independent pulsation modes of 350, 192, 143, 118, and 113 s are identified. The five modes can be used to constrain the fitting models. The rates of period change can be obtained through the O-C method for the modes of 192 and 113 s, which can be used to study the evolution effect of DAV stars. Using the White Dwarf Evolution Code (WDEC; 2018 version), a large sample of DAV star models are evolved. The theoretical modes are calculated and used to fit the observed modes. After fine model fittings, we obtain an optimal model with an absolute difference of phi = 0.06 s. By parameterizing the core oxygen profile, the WDEC procedure can greatly reduce the fitting error of asteroseismological models. According to our optimal model, the distance obtained through the model luminosity is only 1% different from that reported by the Gaia Data Release 2. L19-2 is a massive and hot DAV star with a relatively thick H atmosphere and a thick He layer. The stellar parameters and the rates of period change of our optimal model are slightly modified from that of the previous work. Our optimal model has a large central oxygen abundance. The central oxygen abundance is strongly correlated with the previous physical process of stellar evolution. A lot of asteroseismological work on white dwarfs presents an opportunity to explore the progenitor stars.

资助项目National Natural Science Foundation of China[11803004] ; Yunnan Province Youth Talent Project[2019-182] ; Academician Wang Jingxiu Workstation of Yunnan Province[202005AF150025]
项目资助者National Natural Science Foundation of China[11803004] ; Yunnan Province Youth Talent Project[2019-182] ; Academician Wang Jingxiu Workstation of Yunnan Province[202005AF150025]
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星物理学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP Publishing Ltd
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000828875200001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ZZ-CETI STARS ; WHITE-DWARFS ; GRAVITY MODES ; HYDROGEN-RICH ; EVOLUTION ; INSTABILITY ; OSCILLATIONS ; CONSTRAINTS ; STABILITY
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.ynao.ac.cn/handle/114a53/25383
专题中国科学院天体结构与演化重点实验室
通讯作者Chen, Yanhui
作者单位1.Institute of Astrophysics, Chuxiong Normal University, Chuxiong 675000, People's Republic of China; yanhuichen1987@126.com;
2.School of Physics and Electronical Science, Chuxiong Normal University, Chuxiong 675000, People's Republic of China;
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, People's Republic of China
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Chen, Yanhui. Asteroseismology of the DAV Star L19-2[J]. ASTROPHYSICAL JOURNAL,2022,934(1).
APA Chen, Yanhui.(2022).Asteroseismology of the DAV Star L19-2.ASTROPHYSICAL JOURNAL,934(1).
MLA Chen, Yanhui."Asteroseismology of the DAV Star L19-2".ASTROPHYSICAL JOURNAL 934.1(2022).
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