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Stable accretion from a cold disc in highly magnetized neutron stars
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2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 608, article id A17Article in journal (Refereed) Published
Abstract [en]

Aims. The aim of this paper is to investigate the transition of a strongly magnetized neutron star into the accretion regime with very low accretion rate.& para;& para;Methods. For this purpose, we monitored the Be-transient X-ray pulsar GRO J1008-57 throughout a full orbital cycle. The current observational campaign was performed with the Swift/XRT telescope in the soft X-ray band (0.5-10 keV) between two subsequent Type I outbursts in January and September 2016.& para;& para;Results. The expected transition to the propeller regime was not observed. However, transitions between different regimes of accretion were detected. In particular, after an outburst, the source entered a stable accretion state characterised by an accretion rate of similar to 10(14)-10(15) g s(-1). We associate this state with accretion from a cold (low-ionised) disc of temperature below similar to 6500 K. We argue that a transition to this accretion regime should be observed in all X-ray pulsars that have a certain combination of the rotation frequency and magnetic field strength. The proposed model of accretion from a cold disc is able to explain several puzzling observational properties of X-ray pulsars.

Place, publisher, year, edition, pages
EDP Sciences, 2017. Vol. 608, article id A17
Keywords [en]
X-rays: individuals: GRO J1008-57, X-rays: binaries, magnetic fields, accretion, accretion disks
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-220484DOI: 10.1051/0004-6361/201630248ISI: 000416942200017Scopus ID: 2-s2.0-85037547688OAI: oai:DiVA.org:kth-220484DiVA, id: diva2:1170705
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QC 20180104

Available from: 2018-01-04 Created: 2018-01-04 Last updated: 2018-01-04Bibliographically approved

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