天文学进展2017，Vol.35Issue(2)：190-207,18.DOI:10.3969/j.issn.1000-8349.2017.02.03
银河系甚弱X射线暂现源的研究进展
Review of Galactic Very Faint X-ray Transients
摘要
Abstract
Most transient X-ray binaries (XRBs) in our Galaxy contain accreting black holes or neutron stars. In last twenty years, a new type of X-ray transients, which display very low outburst luminosity (2～10 keV luminosity of approximate 1027～1029 J·s?1), have been detected and termed as very faint X-ray transients (VFXTs). According to current observations and theoretical studies, the long-term averaged mass accretion rate in VFXTs is . 10?13～10?12 M⊙·a?1. Such a low accretion rate can hardly been explained by traditional XRB evolution theory. In this paper we review the observational properties of VFXTs and candidates, including their space distribution, X-ray radiation, companion stars and orbital period distribution. We then summarize the theoretical models for the origin of VFXTs proposed in the literature and discuss their feasibility. It is pointed out that more observations and theoretical studies are needed to illustrate the nature of these exotic ob jects.关键词
吸积/吸积盘/白矮星/中子星/X射线双星/恒星演化Key words
accretion/accretion disk/white dwarf/neutron star/X-ray binary/star evolution分类
天文与地球科学引用本文复制引用
刘佰生,李向东..银河系甚弱X射线暂现源的研究进展[J].天文学进展,2017,35(2):190-207,18.基金项目
国家自然科学基金(11133001, 11133004) （11133001, 11133004）
