|Title||A survey of Helium accreting white dwarfs|
|Author||Dr Gavin Ramsay|
|Description||We propose to carry out a survey of AM CVn systems -- close binaries in which a white dwarf is accreting material from a white dwarf or semi-degenerate helium star. We propose to obtain simultaneous X-ray and UV data with high time resolution. By correlating their light curves we will be able to test disc instability models for Helium dominated discs. These discs are expected to have different properties from Hydrogen dominated discs. The source of X-ray emission in these systems is not known. These observations will conclusively answer this question. We will also search for emission lines in the X-ray spectra- this will allow us to determine the chemical compostion of these systems and hence their evolutionary history.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2005-01-01T00:00:00Z, 014739, 17.56_20190403_1200. https://doi.org/10.5270/esa-vot79po|