|Title||A possible cessation of mass-transfer in previously active cataclysmic variable|
|Author||Dr Vitaly Neustroev|
|Description||Cataclysmic variables (CVs) evolve from longer to shorter orbital periods until a minimum period P_min is reached. Approaching the short period end of the CV orbital period distribution, the mass-transfer rate is decreasing but never vanishes. However, the previously active dwarf nova HO Cet, which orbital period P_orb is very close to P_min, displays excellent evidence for extremely low mass-transfer rate, much lower than in all previously known CVs. Is the mass-transfer in HO Cet terminated completely or its rate is very low but the donor star is still transferring matter?. In this proposal we aim to find evidence for still ongoing accretion in HO Cet through the detection of the object in X-rays. The cessation of mass-transfer is not consistent with prior theory and observations.|
|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, 2020-08-14T22:00:00Z, 084509, 17.56_20190403_1200. https://doi.org/10.5270/esa-ys7mc3j|