| Name | 084127 |
| Title | Long-term phase-connected timing of the unique X-ray binary HD49798 |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0841270101 |
| DOI | https://doi.org/10.57780/esa-4ji0578 |
| Author | Dr SANDRO MEREGHETTI |
| Description | HD49798 is the only known X-ray binary with a hot subdwarf companion. The compact object (a white dwarf or a neutron star) has a spin period of 13 s and has been steadily spinning up at 2x10^{-15} s/s for the last 20 years. Independently of its NS or WD nature, this spin-up is difficult to explain with the angular momentum that accretion can supply. An alternative explanation implies the presence of a young WD, still in the contracting phase. A new observation must be secured as soon as possible in order to extend the phase connected timing solution of this unique binary and shed light on thenature of the compact object. This fulfil proposal was accepted in AO17 (C priority) but not executed. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2020-02-27T06:27:36Z/2020-02-27T19:39:16Z |
| Version | 18.02_20200221_1200 |
| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2021-03-17T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr SANDRO MEREGHETTI, 2021, 084127, 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-4ji0578 |