Low-accretion rate polars escaped detection in the RASS and were discoveredrecently in chance in optical surveys (HQS, SDSS) as CVs in permanent states oflow accretion. The presence of such systems is not predicted by current theoriesof CV evolution. Establishing their detailed properties is the first importantstep in understanding their role in this respect. We propose XMM-Newtonobservations with full-phase coverage of the brightest of the presently known 4systems. With EPIC we test the bombardement accretion scenario. With the OM wedetermine the photospheric temperature distribution of the accreting whitedwarf. This experiment is important for our understanding of the secular heatingand cooling processes in accreting magnetic white dwarfs.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2004-04-24T04:31:45Z/2004-04-24T13:06:55Z
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 AXEL SCHWOPE, 2005, 'THE LOW-ACCRETION RATE POLAR WX LMI', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-us4g8hk
