We propose to study one of the most enigmatic LMXBs in the Galaxy: the 50-min binary dipper and type I X-ray burster 4U1915-05. First, we wish to test the two models (progressive covering versusabsorbed+non-absorbed) proposed to explain the dip behaviour of 4U1915-05, and hence derive constraints on the structure/nature of the absorber. Second, asa follow-up of our extensive RXTE/PCA observing program, we wish to performspectroscopic studies of the short term variability (including X-ray bursts)in the dips. Third, we wish to use the simultaneous optical coverage toconstrain the system clocks and emission regions. These observations which probe directly the inner and outer disk structure will significantly improve our understanding of the accretion process in X-ray binaries.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2002-09-25T03:55:38Z/2002-09-25T08:31:19Z
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 Didier Barret, 2003, 'ON THE ORIGIN OF THE DIPS IN 4U1915-05', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-du6fyic
