摘要：Context.Most of the X-ray binary systems containing neutron stars classified as Atoll sources show two different spectral states, referred to as soft and hard. Moreover, a large number of these systems show a reflection component relativistically smeared in their spectra, which provides information on the innermost region of the system.Aims.Our aim is to investigate the poorly studied broadband spectrum of the low-mass X-ray binary system 4U 1702-429, which was recently analysed combiningXMM-Newtonand INTEGRAL data. The peculiar value of the reflection fraction brought us to analyse further broadband spectra of 4U 1702-429.Methods.We re-analysed the spectrum of theXMM-Newton/INTEGRAL observation of 4U 1702-429 in the 0.3–60 keV energy range and we extracted three 0.1–100 keV spectra of the source analysing three observations collected with theBeppoSAX satellite.Results.We find that theXMM-Newton/INTEGRAL spectrum is well fitted using a model composed of a disc blackbody plus a Comptonised component and a smeared reflection component. We used the same spectral model for theBeppoSAX spectra, finding that the addition of a smeared reflection component is statistically significant. The best-fit values of the parameters are compatible to each other for theBeppoSAX spectra. We find that the reflection fraction is 0.05−0.01+0.3for theXMM-Newton/INTEGRAL spectrum and between 0.15 and 0.4 for theBeppoSAX ones.Conclusions.The relative reflection fraction and the ionisation parameter are incompatible between theXMM-Newton/INTEGRAL and theBeppoSAX observations and the characteristics of the Comptonising corona suggest that the source was in a soft state in the former observation and in a hard state in the latter.
