Kühnel, M. and Müller, S. and Kreykenbohm, I. and Fürst, F. and Pottschmidt, K. and Rothschild, R. E. and Caballero, I. and Grinberg, V. and Schönherr, G. and Shrader, C. and Klochkov, D. and Staubert, R. and Ferrigno, C. and Torrejón, J.-M. and Martínez-Núñez, S. and Wilms, J. (2013) GRO J1008-57: an (almost) predictable transient X-ray binary. Astronomy and Astrophysics, 555 . Art. No. A95. ISSN 0004-6361. doi:10.1051/0004-6361/201321203. https://resolver.caltech.edu/CaltechAUTHORS:20130918-103408804
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Abstract
A study of archival RXTE, Swift, and Suzaku pointed observations of the transient high-mass X-ray binary GRO J1008−57 is presented. A new orbital ephemeris based on pulse arrival-timing shows the times of maximum luminosities during outbursts of GRO J1008−57 to be close to periastron at orbital phase − 0.03. This makes the source one of a few for which outburst dates can be predicted with very high precision. Spectra of the source in 2005, 2007, and 2011 can be well described by a simple power law with high-energy cutoff and an additional black body at lower energies. The photon index of the power law and the black-body flux only depend on the 15–50 keV source flux. No apparent hysteresis effects are seen. These correlations allow us to predict the evolution of the pulsar’s X-ray spectral shape over all outbursts as a function of just one parameter, the source’s flux. If modified by an additional soft component, this prediction even holds during GRO J1008−57’s 2012 type II outburst.
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| Additional Information: | © 2013 ESO. Article published by EDP Sciences. Received 31 January 2013; Accepted 9 May 2013. Published online 08 July 2013. We thank the RXTE-, Swift- and Suzaku-teams for their role in scheduling all observations used within this paper and for accepting our proposals. We especially thank Evan Smith for his help in scheduling the RXTE observations in 2011 April. Many thanks to Hans Krimm for providing the BAT-spectrum during the 2012 giant outburst. We acknowledge funding by the Bundesministerium für Wirtschaft und Technologie under Deutsches Zentrum für Luft- und Raumfahrt grants 50OR0808, 50OR0905, 50OR1113, and the Deutscher Akademischer Austauschdienst. This work has been partially supported by the Spanish Ministerio de Ciencia e Innovación through projects AYA2010-15431 and AIB2010DE-00054. All figures shown in this paper were produced using the SLXfig module, developed by John E. Davis. We thank the referee for her/his helpful comments and suggestions. | ||||||||||||||||
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| Subject Keywords: | X-rays: binaries – pulsars: individual: GRO J1008-57 – accretion, accretion disks – ephemerides | ||||||||||||||||
| DOI: | 10.1051/0004-6361/201321203 | ||||||||||||||||
| Record Number: | CaltechAUTHORS:20130918-103408804 | ||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130918-103408804 | ||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||
| ID Code: | 41380 | ||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||||||
| Deposited On: | 18 Sep 2013 17:46 | ||||||||||||||||
| Last Modified: | 10 Nov 2021 04:29 |
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