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Degenaar, N.; Jonker, P. G.; Torres, M. A. P.; Kaur, R.; Rea, N.; Israel, G. L.; Patruno, A.; Trap, G.; Cackett, E. M.; D'Avanzo, P.; Lo Curto, G.; Novara, G.; Krimm, H.; Holland, S. T.; De Luca, A.; Esposito, P.; Wijnands, R.
Monthly notices of the Royal Astronomical Society, 2010, Letnik: 404, Številka: 3Journal Article
On 2008 May 14, the Burst Alert Telescope onboard the Swift mission triggered on a type-I X-ray burst from the previously unclassified ROSAT object 1RXH J173523.7−354013, establishing the source as a neutron star X-ray binary. We report on X-ray, optical and near-infrared observations of this system. The X-ray burst had a duration of ∼2 h and belongs to the class of rare, intermediately long type-I X-ray bursts. From the bolometric peak flux of ∼3.5 × 10−8 erg cm−2 s−1, we infer a source distance of D≲ 9.5 kpc. Photometry of the field reveals an optical counterpart that declined from R= 15.9 during the X-ray burst to R= 18.9 thereafter. Analysis of post-burst Swift/X-ray Telescope observations as well as archival XMM–Newton and ROSAT data suggests that the system is persistent at a 0.5–10 keV luminosity of ∼2 × 1035 (D/9.5 kpc)2 erg s−1. Optical and infrared photometry together with the detection of a narrow Hα emission line (full width at half maximum = 292 ± 9 km s−1, equivalent width =−9.0 ± 0.4 Å) in the optical spectrum confirms that 1RXH J173523.7−354013 is a neutron star low-mass X-ray binary. The Hα emission demonstrates that the donor star is hydrogen rich, which effectively rules out that this system is an ultracompact X-ray binary.
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in: SICRIS
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