A dataset provided by the European Space Agency

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/10.5270/esa-[xxxxxxx]
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, 2021-03-17T00:00:00Z, 084127, 18.02_20200221_1200. https://doi.org/10.5270/esa-[xxxxxxx]