| Proposal ID | 082022 |
| Title | Long-term phase-connected timing of the unique X-ray binary HD49798 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0820220101 |
| DOI | https://doi.org/10.5270/esa-sk20he0 |
| Principal Investigator, PI | Dr SANDRO MEREGHETTI |
| Abstract | HD49798/RX J0648.0-4418 is the only known X-ray binary in which the donor is ahot subdwarf of O spectral type. The compact object (a white dwarf or a neutronstar) has a spin period of 13.2 s and has been steadily spinning up at2x10^{-15} s/s for the last 20 years. Independently of its NS or WD nature, thisspin-up is difficult to explain with the angular momentum that accretion cansupply. An alternative explanation requires the presence of a young WD, still incontracting phase. We propose a fulfil observation to extend the phase connectedtiming solution in order to investigate the timing properties of this uniquebinary and shed light on the nature of the compact object. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2018-11-08T10:20:38Z/2018-11-08T23:47:51Z |
| Version | PPS_NOT_AVAILABLE |
| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2019-11-23T23:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "phase connected", "rx j0648", "spin period", "compact object", "xray binary", "contracting phase", "2x10 ^{", "steadily spinning", "hot subdwarf", "term phase connected", "xray binary hd49798", "J0648.0", "spectral type", "shed light", "alternative explanation", "neutron star", "white dwarf", "angular momentum" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr SANDRO MEREGHETTI, 2019, 'Long-term phase-connected timing of the unique X-ray binary HD49798', PPS_NOT_AVAILABLE, European Space Agency, https://doi.org/10.5270/esa-sk20he0 |