Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 466, Issue 2, Pages 2143-2150Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw3236
Keywords
X-rays: binaries; X-rays: individual: V 0332+53
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Funding
- Deutsches Zentrum fur Luft- und Raumfahrt (DLR) through DLR- PT grant [50 OR 0702]
- Deutsche Forschungsgemeinschaft (DFG) [WE 1312/48-1]
- Russian Science Foundation [14-12-01287]
- Academy of Finland [268740]
- Foundations' Professor Pool, the Finnish Cultural Foundation
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We report on the analysis of NuSTAR observations of the Be-transient X-ray pulsar V 0332+ 53 during the giant outburst in 2015 and another minor outburst in 2016. We confirm the cyclotronline energy-luminosity correlation previously reported in the source and the line energy decrease during the giant outburst. Based on 2016 observations, we find that a year later the line energy has increased again essentially reaching the pre-outburst values. We discuss this behaviour and conclude that it is likely caused by a change of the emission region geometry rather than previously suggested accretion-induced decay of the neutron stars magnetic field. At lower luminosities, we find for the first time a hint of departure from the anticorrelation of line energy with flux, which we interpret as a transition from super-to sub-critical accretion associated with the disappearance of the accretion column. Finally, we confirm and briefly discuss the orbital modulation observed in the outburst light curve of the source.
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