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The formation of EL CVn-type binaries
Chen XF(陈雪飞)1,2,3; Maxted, P. F. L.4; Li J(李蛟)1,2,5; Han ZW(韩占文)1,2,3
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2017-05-01
Volume467Issue:2Pages:1874-1889
DOI10.1093/mnras/stx115
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual: El Cvn
Abstract

EL CVn-type binaries are eclipsing binaries that contain an A-or F-type dwarf star and a very low mass (similar to 0.2 M-circle dot) helium white dwarf precursor (proto-He WD). A number of such objects have been discovered in the Wide Angle Search for Planets and Kepler photometric surveys. Here, we have studied the formation of EL CVn-type binaries and give the properties and the space density of this population of stars in the Galaxy. We show that EL CVn binaries cannot be produced by common envelope evolution as previously believed because this process leads to merging of the components when giants have such low-mass cores. Stable mass transfer in low-mass binaries, from more than 65 000 runs of Population I binary evolution, may well reproduce the properties of EL CVn stars such as the evolutionary phase, mass ratios and the WD mass-period (M-WD-P) relation. The study shows that the most common donor mass range for producing the observed EL CVn-type stars is 1.15-1.20 M-circle dot and that the lifetime of such objects increases dramatically with decreasing proto-He WD mass. This leads to an intrinsic peak mass around the minimum mass of proto-He WDs of similar to 0.16 M-circle dot. The most probable proto-He WD mass is 0.17-0.21 M-circle dot after selection effects included. We estimated the number of EL CVn stars with P <= 2.2 d to be 2-5 x 10(6) in the Galaxy, indicating a local density of 4-10 x 10(-6) pc-(3). We conclude that many more EL CVn-type binaries remain to be discovered and that these binaries will be predominantly low-mass systems in old stellar populations.

Funding ProjectNatural Science Foundation of China[11422324] ; Natural Science Foundation of China[11521303] ; Natural Science Foundation of China[11390374] ; Yunnan province[2012HB037] ; Yunnan province[2013HA005] ; Chinese Academy of Sciences[KJZD-EW-M06-01]
Funding OrganizationNatural Science Foundation of China[11422324, 11521303, 11390374] ; Yunnan province[2012HB037, 2013HA005] ; Chinese Academy of Sciences[KJZD-EW-M06-01]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000398416700046
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSTELLAR ASTROPHYSICS MESA ; WHITE-DWARF COMPANIONS ; RED-GIANT STAR ; LOW-MASS ; BLUE STRAGGLERS ; ORBITAL-PERIOD ; EVOLUTION ; SYSTEMS ; KEPLER ; PULSATIONS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/10014
Collection大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorChen XF(陈雪飞)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China
4.Astrophysics Group, Keele University, Keele, Staffordshire ST5 5BG, UK
5.University of the Chinese Academy of Sciences, Yuquan Road 19, Shijingshan Block, 100049 Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Chen XF,Maxted, P. F. L.,Li J,et al. The formation of EL CVn-type binaries[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,467(2):1874-1889.
APA Chen XF,Maxted, P. F. L.,Li J,&Han ZW.(2017).The formation of EL CVn-type binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,467(2),1874-1889.
MLA Chen XF,et al."The formation of EL CVn-type binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 467.2(2017):1874-1889.
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