首页|On the Surface Helium Abundance of B-type Hot Subdwarf Stars from the WD+MS Channel of Type Ⅰa Supernovae

On the Surface Helium Abundance of B-type Hot Subdwarf Stars from the WD+MS Channel of Type Ⅰa Supernovae

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The origin of intermediate helium(He)-rich hot subdwarfs is still unclear.Previous studies have suggested that some surviving Type Ⅰa supernovae(SNe Ⅰa)companions from the white dwarf+main-sequence(WD+MS)channel may contribute to the intermediate He-rich hot subdwarfs.However,previous studies ignored the impact of atomic diffusion on the post-explosion evolution of surviving companion stars of SNe Ⅰa,leading to the aspect that they could not explain the observed surface He abundance of intermediate He-rich hot subdwarfs.In this work,by taking the atomic diffusion and stellar wind into account,we trace the surviving companions of SNe Ⅰa from the WD+MS channel using the one-dimensional stellar evolution code MESA until they evolve into hot subdwarfs.We find that the surface He-abundances of our surviving companion models during their core He-burning phases are in a range of-1(＜)log(NHe/NH)(＜)0,which are consistent with those observed in intermediate He-rich hot subdwarfs.This seems to further support the notion that it is possible for surviving companions of SNe Ⅰa in the WD+MS channel to form some intermediate He-rich hot subdwarfs.

(stars:)subdwarfsatomic processesdiffusion

Rui-Jie Ji、Xiang-Cun Meng、Zheng-Wei Liu

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Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,Kunming 650216,China

University of Chinese Academy of Sciences,Beijing 100049,China

Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming 650216,China

International Centre of Supernovae(ICESUN),Yunnan Key Laboratory,Kunming 650216,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key R&D Program of ChinaYunnan Ten Thousand Talents Plan-Young & Elite Talents ProjectCAS"Light of West China"ProgramInternational Centre of Supernovae,Yunnan Key LaboratoryYunnan Revitalization Talent Support Program-Science & Technology Champion ProjectYunnan Fundamental Research ProjectsYunnan Fundamental Research Projectsscience research grants from the China Manned Space Project

NSFC. 12288102123330082021YFA1600403202302AN360001202305AB350003202401BC070007202201BC070003

2024

10.1088/1674-4527/ad3988

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(5)
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