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Kilohertz quasi-periodic oscillations as probes of the X-ray color-color diagram and neutron star accretion-disk structure for Z sources
Wang, De-Hua1; Zhang, Cheng-Min2,3,4; Qu, Jin-Lu5; Jia, Shu-Mei3,5
2020-10-12
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume642Pages:6
AbstractBased on the detected kilohertz quasi-periodic oscillations (kHz QPOs) in neutron star low-mass X-ray binaries (NS-LMXBs), we investigate the evolution of the NS magnetosphere-disk structure along the Z track in the X-ray color-color diagram (CCD) for luminous Z sources, such as Cyg X-2, GX 5-1, GX 17+2, and Sco X-1. We find that the magnetosphere-disk radius r inferred by kHz QPOs for all the sources shows a monotonically decreasing trend along the Z track from the horizontal branch (HB) to the normal branch (NB), implying that the dominated radiation components may dramatically change as the accretion disk moves toward the NS surface. In addition, the specific radius that corresponds to the HB/NB vertex is found to be around r similar to 20 km, implying a potential characteristic position of transiting for the X-ray radiation mode. Furthermore, we find that the NBs that occur near the NS surface have a radius of r similar to 16-20 km, which is systematically smaller than those of HBs that have radii of r similar to 20-29 km. To interpret the relation between the CCD properties and the special magnetosphere-disk radii of Z sources, we suggest that the magnetic field lines corresponding to NB are "frozen-in" to the plasma, and move further inward with the shrinking of the NS magnetosphere-disk radius and pile up near the NS surface. They then form a strong magnetic field region around r similar to 16-20 km, where the high magnetic energy density and high plasma mass density may dominate the radiation process in NB.
KeywordX-rays: binaries stars: neutron binaries: close accretion accretion disks
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Guizhou Provincial Science and Technology Foundation ; Guizhou Provincial Science and Technology Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guizhou Provincial Science and Technology Foundation ; Guizhou Provincial Science and Technology Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guizhou Provincial Science and Technology Foundation ; Guizhou Provincial Science and Technology Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guizhou Provincial Science and Technology Foundation ; Guizhou Provincial Science and Technology Foundation
DOI10.1051/0004-6361/202037435
WOS KeywordATOLL SOURCE STATES ; XTE J1701-462 ; LOW-FREQUENCY ; KHZ QPO ; TIMING FEATURES ; 4U 1728-34 ; MASS ; BINARY ; DISCOVERY ; VARIABILITY
Language英语
Funding ProjectNational Natural Science Foundation of China[11703003] ; National Natural Science Foundation of China[U1938117] ; National Natural Science Foundation of China[U1731238] ; Guizhou Provincial Science and Technology Foundation[[2020]1Y016]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Guizhou Provincial Science and Technology Foundation ; Guizhou Provincial Science and Technology Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guizhou Provincial Science and Technology Foundation ; Guizhou Provincial Science and Technology Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guizhou Provincial Science and Technology Foundation ; Guizhou Provincial Science and Technology Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guizhou Provincial Science and Technology Foundation ; Guizhou Provincial Science and Technology Foundation
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000581916000007
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/80831
Collection中国科学院国家天文台
Corresponding AuthorWang, De-Hua
Affiliation1.Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang 550001, Peoples R China
2.Natl Astron Observ, CAS Key Lab FAST, Beijing 100101, Peoples R China
3.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100101, Peoples R China
5.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, De-Hua,Zhang, Cheng-Min,Qu, Jin-Lu,et al. Kilohertz quasi-periodic oscillations as probes of the X-ray color-color diagram and neutron star accretion-disk structure for Z sources[J]. ASTRONOMY & ASTROPHYSICS,2020,642:6.
APA Wang, De-Hua,Zhang, Cheng-Min,Qu, Jin-Lu,&Jia, Shu-Mei.(2020).Kilohertz quasi-periodic oscillations as probes of the X-ray color-color diagram and neutron star accretion-disk structure for Z sources.ASTRONOMY & ASTROPHYSICS,642,6.
MLA Wang, De-Hua,et al."Kilohertz quasi-periodic oscillations as probes of the X-ray color-color diagram and neutron star accretion-disk structure for Z sources".ASTRONOMY & ASTROPHYSICS 642(2020):6.
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