Kühnel M, Müller S, Kreykenbohm I, Fuerst F, Pottschmidt K, Rothschild RE, Caballero I, Grinberg V, Schoenherr G, Shrader C, Klochkov D, Staubert R, Ferrigno C, Torrejon JM, Martinez-Nunez S, Wilms J (2013)
Publication Status: Published
Publication Type: Journal article
Publication year: 2013
Publisher: EDP SCIENCES S A
Book Volume: 555
Article Number: ARTN A95
DOI: 10.1051/0004-6361/201321203
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.
APA:
Kühnel, M., Müller, S., Kreykenbohm, I., Fuerst, F., Pottschmidt, K., Rothschild, R.E.,... Wilms, J. (2013). GRO J1008-57: an (almost) predictable transient X-ray binary. Astronomy & Astrophysics, 555. https://doi.org/10.1051/0004-6361/201321203
MLA:
Kühnel, Matthias, et al. "GRO J1008-57: an (almost) predictable transient X-ray binary." Astronomy & Astrophysics 555 (2013).
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