The hard to soft spectral transition in LMXBs-affected by recondensation of gas into an inner disk

doi:10.1051/0004-6361/200913044

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	The hard to soft spectral transition in LMXBs-affected by recondensation of gas into an inner disk
	Meyer-Hofmeister, E 1; Liu BF(刘碧芳)2 ; Meyer, F 1; Meyer-Hofmeister, E (reprint author), Max Planck Inst Astrophys, Karl Schwarzschildstr 1, D-85740 Garching, Germany.
发表期刊	ASTRONOMY & ASTROPHYSICS
	2009-12
卷号	508 期号:1 页码:329-337
DOI	10.1051/0004-6361/200913044
产权排序	第2完成单位
收录类别	SCI ; EI
关键词	X-rays: Binaries Accretion Black Hole Physics Accretion Disks Galaxies: Active Stars: Neutron
摘要	Context. Soft and hard spectral states of X-ray transient sources reflect two modes of accretion, accretion via a geometrically thin, optically thick disk or an advection-dominated accretion flow (ADAF). Aims. The luminosity at transition between these two states seems to vary from source to source, or even for the same source during different outbursts, as observed for GX 339-4. We investigate how the existence of an inner weak disk in the hard state affects the transition luminosity. Methods. We evaluate the structure of the corona above an outer truncated disk and the resulting disk evaporation rate for different irradiation. Results. In some cases, recent observations of X-ray transients indicate the presence of an inner cool disk during the hard state. Such a disk can remain during quiescence after the last outburst as long as the luminosity does not drop to very low values (10 (4)-10 (3) of the Eddington luminosity). Consequently, as part of the matter accretes via the inner disk, the hard irradiation is reduced. The hard irradiation is further reduced, occulted and partly reflected by the inner disk. This leads to a hard-soft transition at a lower luminosity. Conclusions. The spectral state transition is expected at lower luminosity if an inner disk exists below the ADAF. This seems to be supported by observations for GX 339-4.
项目资助者	National Natural Science Foundation of China [10533050, 10773028] ; National Basic Research Program of China-973 Program [2009CB824800]
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6361
URL	查看原文
WOS记录号	WOS:000272417700035
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	BLACK-HOLE CANDIDATE ; ADVECTION-DOMINATED ACCRETION ; X-RAY BINARIES ; ALPHA EMISSION-LINE ; LOW/HARD STATE ; XTE J1118+480 ; GX 339-4 ; XMM-NEWTON ; IRON-LINE ; MULTIWAVELENGTH OBSERVATIONS
引用统计	被引频次：28[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4972
专题	高能天体物理研究组
通讯作者	Meyer-Hofmeister, E (reprint author), Max Planck Inst Astrophys, Karl Schwarzschildstr 1, D-85740 Garching, Germany.
作者单位	1.Max-Planck-Institut für Astrophysik, Karl-Schwarzschildstr. 1, 85740 Garching, Germany 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, PR China
推荐引用方式 GB/T 7714	Meyer-Hofmeister, E,Liu BF,Meyer, F,et al. The hard to soft spectral transition in LMXBs-affected by recondensation of gas into an inner disk[J]. ASTRONOMY & ASTROPHYSICS,2009,508(1):329-337.
APA	Meyer-Hofmeister, E,Liu BF,Meyer, F,&Meyer-Hofmeister, E .(2009).The hard to soft spectral transition in LMXBs-affected by recondensation of gas into an inner disk.ASTRONOMY & ASTROPHYSICS,508(1),329-337.
MLA	Meyer-Hofmeister, E,et al."The hard to soft spectral transition in LMXBs-affected by recondensation of gas into an inner disk".ASTRONOMY & ASTROPHYSICS 508.1(2009):329-337.

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