Evolved cataclysmic variables as progenitors of AM CVn stars

doi:10.1093/mnras/stad354

YNAO OpenIR > 大样本恒星演化研究组

	Evolved cataclysmic variables as progenitors of AM CVn stars
	Sarkar, Arnab 1; Ge HW(葛宏伟)1,2,3 ; Tout, Christopher A 1
发表期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2023-02-07
卷号	520 期号:2 页码:3187-3200
DOI	10.1093/mnras/stad354
产权排序	第2完成单位
收录类别	SCI ; EI
关键词	binaries close - stars magnetic field-stars mass-loss - novae cataclysmic variables - stars rotation - white dwarfs
摘要	We model cataclysmic variables (CVs) with solar metallicity donors ( X = 0.7 andZ = 0.02) that evolve to form AM CVn stars through the evolved CV formation channel using various angular momentum loss mechanisms by magnetic braking (AMLMB). We find that the time-scale for AML(MB) in our double-dynamo (DD) model is shorter than that of previously used empirical formulae. Owing to the shorter time-scales, a larger parameter space of initial conditions evolves to form AM CVn stars with the DD model than with other models. We perform an analysis of the expected number of AM CVn stars formed through the Evolved CV channel and find about 3 times as many AM CVn stars as reported before. We evolve these systems in detail with the Cambridge stellar evolution code ( STARS ) and show that evolved CVs populate a region with orbital period P-orb >= 5 . 5 hr . We evolve our donors beyond their orbital period minimum and find that a significant number become extremely H-exhausted systems. This makes them indistinguishable from systems evolved from the He-star and the White Dwarf (WD) channels in terms of the absence of H in their spectra. We also compare the masses, mass-transfer rates of the donor, and the orbital period with observations. We find that the state of the donor and the absence of H in systems such as YZ LMi and V396 Hya match with our modelled trajectories, while systems such as CR Boo and HP Lib match with our modelled tracks if their actual donor mass lies on the lower-end of the observed mass range.
资助项目	Gates Cambridge Trust ; NSFC[12173081] ; key research programme of frontier sciences, CAS[ZDBS-LY-7005] ; Yunnan Fundamental Research Projects[202101AV070001] ; Churchill College
项目资助者	Gates Cambridge Trust ; NSFC[12173081] ; key research programme of frontier sciences, CAS[ZDBS-LY-7005] ; Yunnan Fundamental Research Projects[202101AV070001] ; Churchill College
语种	英语
学科领域	天文学 ; 恒星与银河系 ; 恒星形成与演化
文章类型	Article
出版者	OXFORD UNIV PRESS
出版地	GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN	0035-8711
URL	查看原文
WOS记录号	WOS:000943150500025
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	CLOSE BINARY-SYSTEMS ; STELLAR EVOLUTION ; X-RAY ; SPECTROSCOPY ; POPULATION ; GAIA14AAE ; EMISSION ; DWARFS ; MODELS ; DONORS
EI入藏号	20232214169416
EI主题词	White dwarfs
EI分类号	641.3 Mass Transfer - 657.2 Extraterrestrial Physics and Stellar Phenomena
引用统计	被引频次：4[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/114a53/25876
专题	大样本恒星演化研究组
通讯作者	Sarkar, Arnab; Ge HW(葛宏伟); Tout, Christopher A
作者单位	1.Institute of Astronomy, The Observatories, Madingley Road, Cambridge CB3 OHA, UK; 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China
通讯作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Sarkar, Arnab,Ge HW,Tout, Christopher A. Evolved cataclysmic variables as progenitors of AM CVn stars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2023,520(2):3187-3200.
APA	Sarkar, Arnab,Ge HW,&Tout, Christopher A.(2023).Evolved cataclysmic variables as progenitors of AM CVn stars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,520(2),3187-3200.
MLA	Sarkar, Arnab,et al."Evolved cataclysmic variables as progenitors of AM CVn stars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 520.2(2023):3187-3200.

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