Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-19
Astronomy and Astrophysics
Astrophysics
8 pages, 13 figures. Proceedings of the 5th INTEGRAL Workshop 'The INTEGRAL Universe', Munich, 16-20 February 2004. Accepted f
Scientific paper
Our collaboration is responsible for the study of a sample of 72 low mass X-ray binaries (LMXRB) using the INTEGRAL Core Programme data. In this paper we describe the monitoring programme we have started and the current variability and spectral results on a sample of 8 persistently bright LMXRBs hosting a neutron star (Z and Atoll sources). Current results show that among our sample of sources there seems to be no important difference in the variability of Z sources with respect to Atolls and the first colour-colour and hardness intensity diagrams built in the "traditional" energy bands display the expected patterns. Z sources seem to be harder than the bright Atolls of our sample (above 20 keV) and present no evident cut-off until about 50 keV. A hint of a non-thermal hard tail is seen in Sco X-1 with ISGRI and SPI, similarly to what was previously detected by D'Amico et al. (2001) with RXTE. These results, even if preliminary, show the importance of such a programme and the potential underlying it to understand these sources as a class.
Bazzano Angela
Beckmann Volker
Chenevez Jerome
Chernyakova Maria
Cocchi Massimo
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