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On the spin-up events and spin direction of the X-ray pulsar GX 301-2
Liu, Jiren1,2
2020-08-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume496Issue:3Pages:3991-3995
AbstractRecently, a retrograde neutron star is proposed for the classical wind-fed X-ray pulsar, GX 301-2, to explain the orbital spin-up to spin-down reversal near periastron, based on the stream model invoked to explain the pre-periastron flare of GX 301-2 previously. We study in detail three rare spin-up events detected by Fermi/GBM and find that the spin derivatives are correlated with the Swift/BAT fluxes, following a relation of nu proportional to F-0.75 +/- 0.05. All the spin-up events of GX 301-2 started about 10 d after the periastron, which is the time needed for tidally stripped gas to reach the neutron star. The slow rotation of the optical companion implies that the accreted matter is likely to have angular momentum in the direction of the orbital motion, as in a Roche lobe-like overflow. As a result, the spin-up events of GX 301-2 would favour accretion of a prograde disc to a prograde neutron star. We also find that the flare of intrinsic X-ray emission of GX 301-2 happened 0.4 d before periastron, while the flare of low-energy emission (2-10 keV) happened about 1.4 d before periastron. The preceding low-energy flare can be explained by stronger absorption of the intrinsic X-ray emission closer to the periastron. This finding weakened the need of the stream model. The pulse fraction of GX 301-2 near periastron is reduced heavily, which is likely caused by Compton-scattering process. Compton reflection from the optical companion might be responsible for the observed orbital spin reversal of GX 301-2.
Keywordaccretion, accretion discs pulsars: individual: GX 301-2 stars: rotation X-rays: binaries
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.1093/mnras/staa1774
WOS KeywordACCRETION TORQUES ; BINARY ; SPECTROSCOPY ; WRAY-977 ; STAR
Language英语
Funding ProjectNational Natural Science Foundation of China[11773035] ; National Natural Science Foundation of China[U1938113]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000574919300090
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/81734
Collection中国科学院国家天文台
Corresponding AuthorLiu, Jiren
Affiliation1.Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
2.Beijing Planetarium, 138 Xizhimenwai Rd, Beijing 100044, Peoples R China
Recommended Citation
GB/T 7714
Liu, Jiren. On the spin-up events and spin direction of the X-ray pulsar GX 301-2[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,496(3):3991-3995.
APA Liu, Jiren.(2020).On the spin-up events and spin direction of the X-ray pulsar GX 301-2.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,496(3),3991-3995.
MLA Liu, Jiren."On the spin-up events and spin direction of the X-ray pulsar GX 301-2".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 496.3(2020):3991-3995.
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