|Title||Toward a long-term phase-connected ephemeris for the unique X-ray binary HD49798|
|Author||Dr Sandro MEREGHETTI|
|Description||HD49798 is a unique binary composed of a 13 s pulsator, most likely the fastest-rotating massive white dwarf (1.28 Msun), orbiting the brightest O-type subdwarf. We recently obtained the first phase-connected timing solution, that should be extended over a longer period to unveil the small Pdot variations expected in this system. Their study will allow us to confirm the nature of the compact object, to shed light on the accretion flow geometry and on the magnetic field intensity, and to improve the accuracy on the orbital parameters of this interesting post-common envelope and possibly SN Ia progenitor system. Only if a new period measurement is obtained during the AO12 it will be possible to extend the phase-connection over a long time period with a small requirement on observing time.|
|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, 2014-11-26T00:00:00Z, 072105, 17.56_20190403_1200. https://doi.org/10.5270/esa-c1wq4nl|