The INTEGRAL LMXRB Monitoring Programme
Abstract
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.
Cite
@article{arxiv.astro-ph/0405376,
title = {The INTEGRAL LMXRB Monitoring Programme},
author = {A. Paizis and T. J. -L. Courvoisier and O. Vilhu and M. Chernyakova and T. Tikkanen and A. Bazzano and V. Beckmann and J. Chenevez and M. Cocchi and K. Ebisawa and R. Farinelli and F. Frontera and A. Gimenez and P. Goldoni and D. Hannikainen and E. Kuulkers and N. Lund and T. Oosterbroek and S. Piraino and J. Rodriguez and A. Santangelo and R. Walter and A. A. Zdziarski and J. A. Zurita Heras},
journal= {arXiv preprint arXiv:astro-ph/0405376},
year = {2007}
}
Comments
8 pages, 13 figures. Proceedings of the 5th INTEGRAL Workshop 'The INTEGRAL Universe', Munich, 16-20 February 2004. Accepted for publication in ESA SP-552