A dataset provided by the European Space Agency

Name 082022
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=0820220101
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0820220201

DOI https://doi.org/10.5270/esa-sk20he0
Author Dr SANDRO MEREGHETTI
Description HD49798/RX J0648.0-4418 is the only known X-ray binary in which the donor is a
hot subdwarf of O spectral type. The compact object (a white dwarf or a neutron
star) has a spin period of 13.2 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 requires the presence of a young WD, still in
contracting phase. We propose a fulfil observation to extend the phase connected
timing solution in order to investigate the timing properties of this unique
binary and shed light on the nature of the compact object.
Publication No observations found associated with the current proposal
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 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 2019-11-23T23:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr SANDRO MEREGHETTI, 2019, 082022, PPS_NOT_AVAILABLE, European Space Agency, https://doi.org/10.5270/esa-sk20he0