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Propeller effect in two brightest transient X-ray pulsars: 4U 0115+63 and v 0332+53
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2016 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 593, A16Article in journal (Refereed) Published
Abstract [en]

Aims. We present the results of the monitoring programmes performed with the Swift/XRT telescope and aimed specifically to detect an abrupt decrease of the observed flux associated with a transition to the propeller regime in two well-known X-ray pulsars 4U 0115+63 and V 0332+53. Methods. Both sources form binary systems with Be optical companions and undergo so-called giant outbursts every 3-4 years. The current observational campaigns were performed with the Swift/XRT telescope in the soft X-ray band (0.5-10 keV) during the declining phases of the outbursts exhibited by both sources in 2015. Results. The transitions to the propeller regime were detected at the threshold luminosities of (1.4 ± 0.4) × 1036 erg s-1 and (2.0 ± 0.4) × 1036 erg s-1 for 4U 0115+63 and V 0332+53, respectively. Spectra of the sources are shown to be significantly softer during the low state. In both sources, the accretion at rates close to the aforementioned threshold values briefly resumes during the periastron passage following the transition into the propeller regime. The strength of the dipole component of the magnetic field required to inhibit the accretion agrees well with estimates based on the position of the cyclotron lines in their spectra, thus excluding presence of a strong multipole component of the magnetic field in the vicinity of the neutron star.

Place, publisher, year, edition, pages
EDP Sciences , 2016. Vol. 593, A16
Keyword [en]
Accretion, accretion disks, Magnetic fields, Stars: individual: 4U 0115+63, Stars: individual: V 0332+53, X-rays: binaries, Bins, Magnetism, Propellers, Stars, Telescopes, Accretion, accretion disks, Binary systems, Cyclotron lines, Dipole component, Monitoring programmes, Multipole components, Stars: individual, Pulsars
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-194884DOI: 10.1051/0004-6361/201628236ScopusID: 2-s2.0-84984871131OAI: oai:DiVA.org:kth-194884DiVA: diva2:1055860
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QC 20161213

Available from: 2016-12-13 Created: 2016-11-01 Last updated: 2016-12-13Bibliographically approved

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Poutanen, Juri
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Nordic Institute for Theoretical Physics NORDITA
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