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The radiative efficiency of neutron stars at low-level accretion
Qiao, Erlin1,2; Liu, B. F.1,2
2021-04-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume502Issue:3Pages:3870-3878
AbstractWhen neutron star low-mass X-ray binaries (NS-LMXBs) are in the low-level accretion regime (i.e. L-X less than or similar to 10(36) erg s(-1)), the accretion flow in the inner region around the NS is expected to exist in the form of the hot accretion flow, e.g. the advection-dominated accretion flow (ADAF) as that in black hole X-ray binaries. Following our previous studies in Qiao & Liu (2020a, b) on the ADAF accretion around NSs, in this paper, we investigate the radiative efficiency of NSs with an ADAF accretion in detail, showing that the radiative efficiency of NSs with an ADAF accretion is much lower than that of epsilon similar to (M) over dotGM/R-*/(M) over dot c(2) similar to 0.2 despite the existence of the hard surface. As a result, given an X-ray luminosity L-X (e.g. between 0.5 and 10 keV), (M) over dot calculated by (M) over dot = LX R*/GM is lower than the real Al calculated within the framework of the ADAF accretion. The real (M) over dot can be more than two orders of magnitude higher than that calculated by (M) over dot = L-X R-*/GM with appropriate model parameters. Finally, we discuss that if applicable, the model of ADAF accretion around a NS can be applied to explain the observed millisecond X-ray pulsation in some NS-LMXBs (such as PSR J1023+0038, XSS J12270-4859, and IGR J17379-3747) at a lower X-ray luminosity of a few times of 10(33) erg s(-1), since at this X-ray luminosity the calculated (M) over dot with the model of ADAF accretion can be high enough to drive a fraction of the matter in the accretion flow to be channelled on to the surface of the NS forming the X-ray pulsation.
Keywordaccretion, accretion discs black hole physics stars: neutron X-rays: binaries
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B
DOI10.1093/mnras/stab227
WOS KeywordADVECTION-DOMINATED ACCRETION ; X-RAY ; MILLISECOND PULSAR ; PULSATIONS
Language英语
Funding ProjectNational Natural Science Foundation of China[11773037] ; National Natural Science Foundation of China[11673026] ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15052100] ; National Program on Key Research and Development Project[2016YFA0400804] ; gravitational wave pilot B[XDB23040100]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; gravitational wave pilot B ; gravitational wave pilot B
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000648998800050
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/77723
Collection中国科学院国家天文台
Corresponding AuthorQiao, Erlin
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Qiao, Erlin,Liu, B. F.. The radiative efficiency of neutron stars at low-level accretion[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,502(3):3870-3878.
APA Qiao, Erlin,&Liu, B. F..(2021).The radiative efficiency of neutron stars at low-level accretion.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,502(3),3870-3878.
MLA Qiao, Erlin,et al."The radiative efficiency of neutron stars at low-level accretion".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 502.3(2021):3870-3878.
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