Volume 489, Number 3, October III 2008
|Page(s)||1239 - 1242|
|Section||Stellar structure and evolution|
|Published online||18 August 2008|
The 2007 outburst of the X-ray binary XTE J1856+053*
Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany e-mail: email@example.com
Corresponding author: firstname.lastname@example.org
Accepted: 2 August 2008
Aims. On 28 February 2007 a new outburst of the previously known transient source XTE J1856+053 was detected with RXTE/ASM. We present here the results of an XMM-Newton (0.5–10.0 keV) Target of Opportunity observation performed on 14 March 2007, aimed at constraining the mass of the compact object in this X-ray binary and determining its main properties.
Methods. The EPIC-pn camera was used in Timing mode and its spectrum fit together with the RGS data. IR observations with GROND at the 2.2 m telescope in La Silla provide further information on the system.
Results. The X-ray light curve shows that both the 1996 and the 2007 outbursts had two peaks. The X-ray spectrum is well fit with a thermal accretion disk model, with kTin = 0.75(±0.01) keV and foreground absorption = 4.5(±0.1)1022 cm-2. The low disk temperature favours a black-hole as accreting object, with an estimated mass in the range 1.3–4.2 . From the IR upper limits we argue that XTE J1856+053 is a low mass X-ray binary. We estimate the orbital period of the system to be between 3 and 12 h.
Key words: X-rays: binaries / stars: binaries: close / X-rays: individuals: XTE J1856+053
© ESO, 2008
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