The kHz QPOs as a probe of the X-ray color-color diagram and accretion-disk structure for the atoll source 4U 1728-34

doi:10.1051/0004-6361/201832651

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	The kHz QPOs as a probe of the X-ray color-color diagram and accretion-disk structure for the atoll source 4U 1728-34
	Wang, De-Hua 2; Zhang, Cheng-Min 3,4,5; Qu, Jin-Lu 1
刊名	ASTRONOMY & ASTROPHYSICS
	2018-11-01
卷号	618 页码:6
关键词	X-rays: binaries stars: neutron stars: individual: 4U 1728-34 accretion, accretion disks
ISSN号	1432-0746
DOI	10.1051/0004-6361/201832651
英文摘要	We have taken the kHz QPOs as a tool to probe the correlation between the tracks of X-ray color-color diagram (CCD) and magnetosphere-disk positions for the atoll source 4U 1728-34, based on the assumptions that the upper kHz QPO is ascribed to the Keplerian orbital motion and the neutron star (NS) magnetosphere is defined by the dipole magnetic field. We find that from the island to the banana state, the inner accretion disk gradually approaches the NS surface with the radius decreasing from r similar to 33.0 km to similar to 15.9 km, corresponding to the magnetic field from B(r) similar to 4.8 x 10(6) G to similar to 4.3 x 10(7) G. In addition, we note the characteristics of some particular radii of magnetosphere-disk r are.firstly, the whole atoll shape of the CCD links the disk radius range of similar to 15.9-33.0 km, which is just located inside the corotation radius of 4U 1728-34 r(infinity) (similar to 34.4 km), implying that the CCD shape is involved in the NS spin-up state. Secondly, the island and banana states of CCD correspond to the two particular boundaries.(I) near the corotation radius at r similar to 27.2-33.0 km, where the source lies in the island state; (II) near the NS surface at r similar to 15.9-22.3 km, where the source lies in both the island and banana states. Thirdly, the vertex of the atoll shape in CCD, where the radiation transition from the hard to soft photons occurs, is found to be near the NS surface at r similar to 16.4 km. The above results suggest that both the magnetic field and accretion environment are related to the CCD structure of atoll track, where the corotation radius and NS hard surface play the significant roles in the radiation distribution of atoll source.
资助项目	National Program on Key Research and Development Project[2016YFA0400803] ; National Natural Science Foundation of China[11703003] ; National Natural Science Foundation of China[11673023] ; National Natural Science Foundation of China[U1731238]
WOS关键词	QUASI-PERIODIC OSCILLATIONS ; NEUTRON-STAR ; MAGNETIC-FIELD ; XTE J1701-462 ; TIMING FEATURES ; SPECTRAL STATES ; LOW-FREQUENCY ; BINARIES ; EVOLUTION ; MODEL
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000449280200001
资助机构	National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/23143]
专题	中国科学院国家天文台
通讯作者	Wang, De-Hua
作者单位	1.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China 2.Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang 550001, Guizhou, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 101400, Peoples R China 5.Chinese Acad Sci, CAS Key Lab FAST, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Wang, De-Hua,Zhang, Cheng-Min,Qu, Jin-Lu. The kHz QPOs as a probe of the X-ray color-color diagram and accretion-disk structure for the atoll source 4U 1728-34[J]. ASTRONOMY & ASTROPHYSICS,2018,618:6.
APA	Wang, De-Hua,Zhang, Cheng-Min,&Qu, Jin-Lu.(2018).The kHz QPOs as a probe of the X-ray color-color diagram and accretion-disk structure for the atoll source 4U 1728-34.ASTRONOMY & ASTROPHYSICS,618,6.
MLA	Wang, De-Hua,et al."The kHz QPOs as a probe of the X-ray color-color diagram and accretion-disk structure for the atoll source 4U 1728-34".ASTRONOMY & ASTROPHYSICS 618(2018):6.