We propose to carry out a survey of AM CVn systems -- close binaries in which awhite dwarf is accreting material from a white dwarf or semi-degenerate heliumstar. We propose to obtain simultaneous X-ray and UV data with high timeresolution. By correlating their light curves we will be able to test discinstability models for Helium dominated discs. These discs are expected to havedifferent properties from Hydrogen dominated discs. The source of X-ray emissionin these systems is not known. These observations will conclusively answer thisquestion. We will also search for emission lines in the X-ray spectra- this willallow us to determine the chemical compostion of these systems and hence theirevolutionary history.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2003-05-23T20:14:48Z/2003-11-24T17:58:34Z
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 Gavin Ramsay, 2005, 'A survey of Helium accreting white dwarfs', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-vot79po
