GRO J1008−57: an (almost) predictable transient X-ray binary

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Title: GRO J1008−57: an (almost) predictable transient X-ray binary
Authors: Kühnel, Matthias | Müller, Sebastian | Kreykenbohm, Ingo | Fürst, Felix | Pottschmidt, Katja | Rothschild, Richard E. | Caballero, Isabel | Grinberg, Victoria | Schönherr, Gabriele | Shrader, Chris | Klochkov, Dmitry | Staubert, Rüdiger | Ferrigno, Carlo | Torrejon, Jose M. | Martínez Núñez, Silvia | Wilms, Jörn
Research Group/s: Astronomía y Astrofísica
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal
Keywords: X-rays: binaries | Pulsars: individual: GRO J1008-57 | Accretion, accretion disks | Ephemerides
Knowledge Area: Astronomía y Astrofísica | Física Aplicada
Issue Date: 8-Jul-2013
Publisher: EDP Sciences
Citation: Astronomy & Astrophysics. 2013, 555: A95. doi:10.1051/0004-6361/201321203
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.
Sponsor: 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.
ISSN: 0004-6361 (Print) | 1432-0746 (Online)
DOI: 10.1051/0004-6361/201321203
Language: eng
Type: info:eu-repo/semantics/article
Rights: © ESO, 2013
Peer Review: si
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Appears in Collections:INV - Astronomía y Astrofísica - Artículos de Revistas

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