A dataset provided by the European Space Agency

Name 015010
Title WZ Sagittae in Quiescence: Magnetic or Pulsating White Dwarf
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0150100101

DOI 10.5270/esa-ym32j77
Author Dr Koji Mukai
Description WZ Sagittae is the prototype of a subclass of dwarf novae with extremely long recurrence period. We don.t understand yet how to keep WZ Sge in quiescence for 30 years, unless it has a magnetic white dwarf. This seems likely, since there is a 27.87 s periodicity in the optical, UV, and probably in ASCA data. However, the ASCA detection wasn.t as convincing as we had hoped. Moreover, there are other periodic signals near 28 s, which the magnetic white dwarf model struggles to explain, leading to the advent of the pulsating white dwarf model. We propose multiple XMM-Newton pointings to distinguish between these two models.
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Automatic Classification of Time-variable X-Ray Sources . Lo, Kitty K., Farrell, Sean, et all. . ApJ . 786-20 . 2014 . 2014ApJ...786...20L ,
XMM-Newton and Swift observations of WZ Sagittae: spectral and timing analysi...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2003-05-16T14:52:07Z/2003-05-16T17:37:25Z
Version 17.56_20190403_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 2004-05-31T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2004-05-31T00:00:00Z, 015010, 17.56_20190403_1200. https://doi.org/10.5270/esa-ym32j77