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Distinguishing Core and Shell Helium-burning Subdwarf B Stars by Asteroseismology
Guo JJ(郭军军)1,2,3
发表期刊ASTROPHYSICAL JOURNAL
2018-10-10
卷号866期号:1页码:9
DOI10.3847/1538-4357/aadd05
产权排序第1完成单位
收录类别SCI
关键词methods: numerical stars: oscillations subdwarfs
摘要

Subdwarf B stars are generally considered to be core helium-burning stars. However, most canonical sdB models have shown that they leave the sdB band (i.e., the region with 20,000 K <= T-eff 40,000 K and 5 <= log g <= 6.2) after they have ignited helium in the shell. This means there will be a few shell helium-burning stars that have exhausted their helium in the core yet may still be located on the sdB band and should be considered as sdB stars too. But because they have effective temperature and gravity close to those of core helium-burning sdB stars, we cannot distinguish the two kinds of star just by atmospheric parameters. Some sdB stars display multimode pulsations. We thought that asteroseismology could offer some methods to distinguish the two kinds of sdB star. Core and shell helium-burning sdB stars have some obvious differences in structure and evolutionary track, which results in some clear differences in their pulsation properties. So, we may distinguish them by their pulsation properties such as the rates of change of period of the p-mode sdB pulsators, the numbers of mixed modes, and the period spacings of the g-mode sdB pulsators. We suggest that there are two special sdB stars (V391 Pegasi and PG 1605+072) that are likely shell helium-burning sdB stars.

资助项目NSFC of China[11333006] ; NSFC of China[11521303] ; NSFC of China[11773064] ; NSFC of China[11503076] ; foundation of Chinese Academy of Sciences[XDB09010202] ; Yunnan Applied Basic Research Projects[2017B008]
项目资助者NSFC of China[11333006, 11521303, 11773064, 11503076] ; foundation of Chinese Academy of Sciences[XDB09010202] ; Yunnan Applied Basic Research Projects[2017B008]
语种英语
学科领域天文学
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:000447200800006
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]COMPACT PULSATORS ; SDB STARS ; DRIVING MECHANISM ; GRAVITY MODES ; EVOLUTION ; OSCILLATIONS ; PARAMETERS ; ATMOSPHERE ; CAMPAIGN ; K2
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/18032
专题恒星物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Guo JJ(郭军军)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, People's Republic of China
2.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, People's Republic of China
3.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
推荐引用方式
GB/T 7714
Guo JJ. Distinguishing Core and Shell Helium-burning Subdwarf B Stars by Asteroseismology[J]. ASTROPHYSICAL JOURNAL,2018,866(1):9.
APA Guo JJ.(2018).Distinguishing Core and Shell Helium-burning Subdwarf B Stars by Asteroseismology.ASTROPHYSICAL JOURNAL,866(1),9.
MLA Guo JJ."Distinguishing Core and Shell Helium-burning Subdwarf B Stars by Asteroseismology".ASTROPHYSICAL JOURNAL 866.1(2018):9.
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