An XMM-Newton view of the dipping low-mass X-ray binary XTE J1710-281

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Volume 502 / No 3 (August II 2009)

A&A, 502 3 (2009) 905-912

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Table 1:

Best fit spectral parameters for the persistent, the shallow-dipping, and the deep-dipping spectra fit simultaneously with the partial covering model.
Parameter	Per. emission	Shallow dip		Deep dip
$N_{\rm H}^{\rm fore} ~(10^{22}$ cm^-2)		$0.385 \pm 0.007$
Photon index		$1.91 \pm 0.02$
Norm. (photons keV^-1 cm^-2 s^-1)		$0.0117 \pm 0.0002$
$N_{\rm H}^{\rm pow}~(10^{22}$ cm^-2)	0.0 Fixed	$\rm 77_{-38}^{+67}$		$14 \pm 2$
Significance			2.7 $\sigma$
f	0.0 Fixed	$0.26 \pm 0.01$		$0.776 \pm 0.009$
Significance			>10 $\sigma$
Reduced $\chi^{2} = 1.55$ for 767 d.o.f.

Note:: The foreground hydrogen column density, $N_{\rm H}^{\rm fore}$ , the photon index and the normalization of the power law are linked between persistent, shallow and deep-dipping emission. The covering fraction f and the hydrogen column density, $N_{\rm H}^{\rm pow}$ , are allowed to vary to explain the spectral changes in the spectra. Uncertainties are given at a 90% confidence level. We also indicate the significance of the change of $N_{\rm H}^{\rm pow}$ and f between shallow and deep-dipping spectra.

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