|Title||The Nature of the Luminous Supersoft X-ray Sources|
|Author||Dr Katherine McGowan|
|Description||The highly luminous (>=10e37 erg-s) supersoft X-ray sources (SSS) are believed to be super-Eddington limited accreting white dwarfs undergoing surface hydrogen burning. The current paradigm for SSS (van den Heuvel et al. 1992) involves thermally unstable mass transfer from a 1-2 Msun companion. But this model has never been directly confirmed and yet is crucial for the evolution of cataclys- mic variables in general, and for the establishment of SSS as progenitors of type Ia supernovae in particular. The key SSS is RXJ0513.9-6951 which has recurrent X-ray outbursts every 100-150d (lasting virgul30d) during which the optical declines by 1 mag. We request TOO status to be triggered by optical monitoring so as to follow directly the predicted expansion of the white dwarf photosphere.|
|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, 2005-06-18T00:00:00Z, 015141, 17.56_20190403_1200. https://doi.org/10.5270/esa-5uf63pe|