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The origin of subdwarf B stars - I. The formation channels
Han ZW(韩占文)1; Podsiadlowski, P2; Maxted, PFL3; Marsh, TR4; Ivanova, N2,5; Han, Z (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2002-10-21
卷号336期号:2页码:449-466
DOI10.1046/j.1365-8711.2002.05752.x
产权排序第1完成单位
收录类别SCI
关键词Methods : Numerical Binaries : Close Stars : Formation Subdwarfs White Dwarfs
摘要Subdwarf B (sdB) stars (and related sdO/sdOB stars) are believed to be helium-core-burning objects with very thin hydrogen-rich envelopes. In recent years it has become increasingly clear from observational surveys that a large fraction of these objects are members of binary systems. To understand their formation better, we present the results of a detailed investigation of the three main binary evolution channels that can lead to the formation of sdB stars: the common-envelope (CE) ejection channel, the stable Roche lobe overflow (RLOF) channel, and the double helium white dwarfs (WDs) merger channel. The CE ejection channel leads to the formation of sdB stars in short-period binaries with typical orbital periods between 0.1 and 10 d, very thin hydrogen-rich envelopes and a mass distribution sharply peaked around similar to0.46 M-.. On the other hand, under the assumption that all mass transferred is soon lost, the stable RLOF channel produces sdB stars with similar masses but long orbital periods (400-1500 d) and with rather thick hydrogen-rich envelopes. The merger channel gives rise to single sdB stars whose hydrogen-rich envelopes are extremely thin but which have a fairly wide distribution of masses (0.4-0.65 M-.). We obtained the conditions for the formation of sdB stars from each of these channels using detailed stellar and binary evolution calculations where we modelled the detailed evolution of sdB stars and carried out simplified binary population synthesis simulations. The observed period distribution of sdB stars in compact binaries strongly constrains the CE ejection parameters. The best fits to the observations are obtained for very efficient CE ejection where the envelope ionization energy is included, consistent with previous results. We also present the distribution of sdB stars in the T (eff) -log g diagram, the Hertzsprung-Russell diagram and the distribution of mass functions.
语种英语
学科领域Astronomy & Astrophysics
文章类型Review
ISSN0035-8711
URL查看原文
归档日期2002-10-21
WOS记录号WOS:000178605800015
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]COMMON ENVELOPE EVOLUTION ; HORIZONTAL-BRANCH STARS ; MASS-RATIO DISTRIBUTION ; INFRARED FLUX EXCESSES ; LARGE MAGELLANIC CLOUD ; PALOMAR-GREEN SURVEY ; NEUTRINO ENERGY-LOSS ; DOUBLE WHITE-DWARFS ; STELLAR EVOLUTION ; HOT SUBDWARFS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/4397
专题大样本恒星演化研究组
通讯作者Han, Z (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, PO Box 110, Kunming, 650011, China
2.Department of Astrophysics, University of Oxford, Oxford OX1 3RH
3.Department of Physics, Keele University, Staffordshire ST5 5BG
4.University of Southampton, Department of Physics and Astronomy, Highfield, Southampton SO17 1BJ
5.Department of Physics and Astronomy, Northwestern University, Evanston, 1L 60208, USA
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Han ZW,Podsiadlowski, P,Maxted, PFL,et al. The origin of subdwarf B stars - I. The formation channels[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2002,336(2):449-466.
APA Han ZW,Podsiadlowski, P,Maxted, PFL,Marsh, TR,Ivanova, N,&Han, Z .(2002).The origin of subdwarf B stars - I. The formation channels.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,336(2),449-466.
MLA Han ZW,et al."The origin of subdwarf B stars - I. The formation channels".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 336.2(2002):449-466.
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