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Issue A&A
Volume 469, Number 3, July III 2007
Page(s) 1063 - 1068
Section Stellar structure and evolution
DOI 10.1051/0004-6361:20077189



A&A 469, 1063-1068 (2007)
DOI: 10.1051/0004-6361:20077189

A probable accretion-powered X-ray pulsar in IGR J00370+6122

J. J. M. in 't Zand1, 2, L. Kuiper1, P. R. den Hartog1, W. Hermsen1, 3, and R. H. D. Corbet4, 5

1  SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
    e-mail: jeanz@sron.nl
2  Astronomical Institute, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands
3  Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
4  X-ray Astrophysics Laboratory, Code 662, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
5  Universities Space Research Association, USA

(Received 29 January 2007 / Accepted 24 April 2007)

Abstract
Serendipitous and dedicated observations with the Rossi X-ray Timing Explorer (RXTE) and the International Gamma-Ray Astrophysics Laboratory (INTEGRAL) were analyzed to study the transient high-mass X-ray binary IGR J00370+6122, in particular to search for an accretion-powered pulsar as companion to the optically identified (Reig et al. 2005, A&A, 440, 637) B0.5 II-III donor star. Highly variable fluxes were measured in the RXTE data during outbursts of up to 2.2 $\times$ 10-10 erg cm-2 s-1 (3-20 keV; averaged over 1 h). During a 1-h time span with RXTE flaring activity was detected with an oscillating signal repeating 7 times. Epoch folding reveals a 346 $\pm$ 6 s period. We propose that this is the period of the putative pulsar. This measurement puts the source in the wind-fed accretion region of the $P_{\rm orb}$ (=15.7 d) versus $P_{\rm pulse}$ "Corbet" diagram. The 3 to 60 keV flare spectrum was modeled with an absorbed power law and the absorption column was found to be 15-20 times larger than the interstellar value and the value obtained for the optical counterpart, suggesting an accretor embedded in the wind of the donor star.


Key words: X-rays: binaries -- X-rays: individuals: IGR J00370+6122 -- X-rays: individuals: 1RXS J003709.6+612131 -- X-rays: individuals 1RXS J003357.9+612645 -- accretion, accretion disks -- stars: neutron



© ESO 2007


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