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A New Route to Massive Hot Subdwarfs: Common Envelope Ejection from Asymptotic Giant Branch Stars

文献类型：期刊论文

作者Li ZW(李振威)1,2,3; Zhang, Yangyang5; Chen HL(陈海亮)1,2,3; Ge HW(葛宏伟)1,2,3; Jiang DK(姜登凯)1,2,3; Li JD(李江丹)1,2,3; Chen XF(陈雪飞)1,2,3; Han ZW(韩占文)1,2,3,4
刊名ASTROPHYSICAL JOURNAL
出版日期2024-03-01
卷号964期号:1
ISSN号0004-637X
DOI10.3847/1538-4357/ad2206
产权排序第1完成单位
文献子类Article
英文摘要The hot subdwarf O/B stars (sdO/Bs) are known as extreme horizontal branch stars, which is of great importance in stellar evolution theory. The sdO/Bs are generally thought to have a helium-burning core and a thin hydrogen envelope (M env < 0.02 M (circle star)). In the canonical binary evolution scenario, sdO/Bs are considered to be the stripped cores of red giants. However, such a scenario cannot explain the recently discovered sdO/B binary SMSS J1920, where the strong Ca H and K lines in the spectrum are found. It suggests that this binary likely originated from the recent ejection of the common envelope (CE). In this work, we propose a new formation channel of massive sdO/Bs, namely, sdO/Bs produced from a CE ejection process with an asymptotic giant branch (AGB) star (hereafter the AGB CE channel). We constructed the evolutionary model of sdO/Bs and successfully explained most of the important observed parameters of the sdO/B star in SMSS J1920, including the evolutionary age, sdO/B mass, effective temperature, surface gravity, and surface helium abundance. The minimum sdO/B mass produced from the AGB CE channel is about 0.48 M-circle star. The evolutionary tracks in the logTeff-logg plane may explain a fraction of the observational samples with high logTeff and low logg . Considering the wind mass loss of sdO/Bs, the model could produce helium-rich hot subdwarfs with log(nHe/nH)greater than or similar to-1 .
学科主题天文学
URL标识查看原文
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
WOS关键词WHITE-DWARF ; B-STARS ; CONVECTIVE BOUNDARIES ; RICH SUBDWARFS ; STELLAR HALO ; ASTROPHYSICS ; BINARIES ; MODULES ; MESA ; EVOLUTION
资助项目MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[12125303]; MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[12288102]; MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[12090040/3]; MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[11733008]; MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[12103086]; MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[11703081]; MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[11422324]; MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[12073070]; Natural Science Foundation of China[2021YFA1600403]; Natural Science Foundation of China[2021YFA1600400]; Natural Science Foundation of China[202305AB350003]; National Key R&D Program of China[2018076]; Youth Innovation Promotion Association of the Chinese Academy of Sciences[ZDBS-LY-7005]; Key Research Program of Frontier Sciences of CAS[202301AT070314]; Key Research Program of Frontier Sciences of CAS[202101AU070276]; Key Research Program of Frontier Sciences of CAS[202101AV070001]; Yunnan Fundamental Research Projects[202302AN360001]; International Centre of Supernovae, Yunnan Key Laboratory[CMS-CSST-2021-A10]; International Centre of Supernovae, Yunnan Key Laboratory[CMS-CSST-2021-A08]; China Manned Space Project; Stellar Astrophysics Group at Yunnan Observatories, Chinese Academy of Sciences
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP Publishing Ltd
WOS记录号WOS:001183782700001
资助机构MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[12125303, 12288102, 12090040/3, 11733008, 12103086, 11703081, 11422324, 12073070] ; Natural Science Foundation of China[2021YFA1600403, 2021YFA1600400, 202305AB350003] ; National Key R&D Program of China[2018076] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[ZDBS-LY-7005] ; Key Research Program of Frontier Sciences of CAS[202301AT070314, 202101AU070276, 202101AV070001] ; Yunnan Fundamental Research Projects[202302AN360001] ; International Centre of Supernovae, Yunnan Key Laboratory[CMS-CSST-2021-A10, CMS-CSST-2021-A08] ; China Manned Space Project ; Stellar Astrophysics Group at Yunnan Observatories, Chinese Academy of Sciences
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/26471]  
专题云南天文台_大样本恒星演化研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.International Centre of Supernovae, Yunnan Key Laboratory, Kunming, 650216, People's Republic of China;
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science, People's Republic of China;
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, People's Republic of China; lizw@ynao.ac.cn, cxf@ynao.ac.cn;
4.University of the Chinese Academy of Science, Yuquan Road 19, Shijingshan Block, 100049, Beijing, People's Republic of China
5.Zhoukou Normal University, East Wenchang Street, Chuanhui District, Zhoukou, 466001, People's Republic of China;
推荐引用方式
GB/T 7714		 Li ZW,Zhang, Yangyang,Chen HL,et al. A New Route to Massive Hot Subdwarfs: Common Envelope Ejection from Asymptotic Giant Branch Stars[J]. ASTROPHYSICAL JOURNAL,2024,964(1).
APA 李振威.,Zhang, Yangyang.,陈海亮.,葛宏伟.,姜登凯.,...&韩占文.(2024).A New Route to Massive Hot Subdwarfs: Common Envelope Ejection from Asymptotic Giant Branch Stars.ASTROPHYSICAL JOURNAL,964(1).
MLA 李振威,et al."A New Route to Massive Hot Subdwarfs: Common Envelope Ejection from Asymptotic Giant Branch Stars".ASTROPHYSICAL JOURNAL 964.1(2024).

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来源：云南天文台

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