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Long-term evolution of the neutron-star spin period of SXP 1062

Sturm, R, Haberl, F, Oskinova, LM, Schurch, MPE, Hénault-Brunet, V, Gallagher, JS and Udalski, A (2013) Long-term evolution of the neutron-star spin period of SXP 1062 Astronomy and Astrophysics, 556.

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Context. The Be/X-ray binary SXP 1062 is of especial interest owing to the large spin period of the neutron star, its large spin-down rate, and the association with a supernova remnant constraining its age. This makes the source an important probe for accretion physics. Aims. To investigate the long-term evolution of the spin period and associated spectral variations, we performed an XMM-Newton target-of-opportunity observation of SXP 1062 during X-ray outburst. Methods. Spectral and timing analysis of the XMM-Newton data was compared with previous studies, as well as complementary Swift/XRT monitoring and optical spectroscopy with the SALT telescope were obtained. Results. The spin period was measured to be Ps = (1071.01 ± 0.16) s on 2012 Oct. 14. The X-ray spectrum is similar to that of previous observations. No convincing cyclotron absorption features, which could be indicative for a high magnetic field strength, are found. The high-resolution RGS spectra indicate the presence of emission lines, which may not completely be accounted for by the SNR emission. The comparison of multi-epoch optical spectra suggest an increasing size or density of the decretion disc around the Be star. Conclusions. SXP 1062 showed a net spin-down with an average of á-s = (2.27 ± 0.44) s yr-1 over a baseline of 915 days. © ESO, 2013.

Item Type: Article
Authors :
Sturm, R
Haberl, F
Oskinova, LM
Schurch, MPE
Hénault-Brunet, V
Gallagher, JS
Udalski, A
Date : 20 August 2013
DOI : 10.1051/0004-6361/201321755
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:58
Last Modified : 17 May 2017 12:58

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