Evaporation: The change from accretion via a thin disk to a coronal flow

	Evaporation: The change from accretion via a thin disk to a coronal flow
	Meyer, F 1; Liu BF(刘碧芳)1,2; Meyer-Hofmeister, E 1
刊名	ASTRONOMY & ASTROPHYSICS
	2000-09
卷号	361 期号:1 页码:175-188
关键词	accretion, accretion disks black hole physics X-rays : stars stars : individual : Cygnus X-1, Nova Muscae 1991 galaxies : nuclei
ISSN号	0004-6361
通讯作者	Meyer-Hofmeister, E
产权排序	第二完成单位
英文摘要	We present a model for a corona above a geometrically thin standard disk around a black hole. This corona is fed by matter from the thin disk which evaporates from the cool layers underneath. An equilibrium establishes between the cool accretion stream and the hot flow. In the inner region evaporation becomes so efficient that at low accretion rates all matter flows via the corona and proceeds towards the black hole as an advection-dominated accretion flow (ADAF). We investigate this transition for accretion disks around stellar black holes. We derive a set of four ordinary differential equations which describe the relevant processes and solve them numerically. The evaporation efficiency has a maximum value where the advection-dominated structure of the corona (at large distances from the black hole) changes to a radiation-dominated structure (at small distances). This maximum can be related to the observed spectral transitions in black hole X-ray binaries. Our solutions of coronal structure are valid for both, accretion in galactic X-ray transients and in AGN.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ADVECTION-DOMINATED ACCRETION ; X-RAY NOVAE ; BLACK-HOLES ; CYGNUS X-1 ; SPECTRAL EVOLUTION ; GLOBAL STRUCTURE ; DWARF NOVAE ; QUIESCENCE ; TRANSITIONS ; ATMOSPHERES
收录类别	SCI
原文出处	http://adsabs.harvard.edu/abs/2000A%26A...361..175M
语种	英语
WOS记录号	WOS:000089510600024
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4933]
专题	云南天文台_高能天体物理研究组
作者单位	1.Max-Planck-Institut f¨ur Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching, Germany 2.Chinese Academy of Sciences, Yunnan Observatory, P.O.Box 110, Kunming 650011, P.R. China
推荐引用方式 GB/T 7714	Meyer, F,Liu BF,Meyer-Hofmeister, E. Evaporation: The change from accretion via a thin disk to a coronal flow[J]. ASTRONOMY & ASTROPHYSICS,2000,361(1):175-188.
APA	Meyer, F,Liu BF,&Meyer-Hofmeister, E.(2000).Evaporation: The change from accretion via a thin disk to a coronal flow.ASTRONOMY & ASTROPHYSICS,361(1),175-188.
MLA	Meyer, F,et al."Evaporation: The change from accretion via a thin disk to a coronal flow".ASTRONOMY & ASTROPHYSICS 361.1(2000):175-188.