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

	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
刊名	ASTRONOMY & ASTROPHYSICS
	2009-12
卷号	508 期号:1 页码:329-337
关键词	accretion, accretion disks X-rays: binaries black hole physics galaxies: active stars: neutron
ISSN号	0004-6361
通讯作者	Meyer-Hofmeister, E (reprint author), Max Planck Inst Astrophys, Karl Schwarzschildstr 1, D-85740 Garching, Germany.
产权排序	第二完成单位
英文摘要	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.
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]	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
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2009/46/aa13044-09/aa13044-09.html
语种	英语
WOS记录号	WOS:000272417700035
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4972]
专题	云南天文台_高能天体物理研究组
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. 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.(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.