ASCA and BeppoSAX obs. of ultracompact (Porb<1hr) LMXBs revealed 2 possiblespectral differences compared to other systems.These are (1)the presence of adiscrete feature near 0.7keV (attributed to local overabundance of Ne), and(2)the parameter values when fit with a disk-blackbody and Comptonizedcontinuum.Chandra and XMM observations complicated the picture, confirming a Neoverabundance only in few ultracompact sources, suggesting a possiblevariability. We wish to test2possible explanations for this variability, and toclarify the emerging picture of a spectral signature for the ultracompactsystems using XMM.We propose here to observeX1832-330,the only persistentultracompact LMXRB in a globular cluster still not investigated with high resolution spectroscopy.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2006-09-22T00:50:14Z/2006-10-20T15:42:40Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr Lara Sidoli, 2007, 'A POSSIBLE SPECTRAL SIGNATURE OF ULTRACOMPACT LOW MASS X-RAY BINARIES', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-fqagk74
