A dataset provided by the European Space Agency

Name 050044
Title HD 109962: the Most Massive Dwarf Nova?


DOI 10.5270/esa-1tfcekw
Author Prof Frederick M Walter
Description HD 109962, a bright F2 star and an ellipsoidal variable, is a recently-recognized erupting variable star. Fairly regular outbursts over the past 5 years suggest it is a dwarf nova. Spectra during the Jan 2006 outburst revealed strong He II 4686 emission, and the residual spectrum (outburst - post outburst) is that of an accretion disk. The large mass function suggests a total system mass of about 2.3 solar masses, making this one of the most massive dwarf novae known. The radial velocity curve of the primary suggests either an eccentric orbit or shadowing by an asymmetric disk. Both possibilities are interesting. We propose to observe for one binary orbit (80 ksec) to study the quiescent X-ray emission, study the orbital modulation of the X-ray flux, and look for an X-ray eclipse
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Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2007-06-28T07:15:28Z/2007-06-29T07:23:39Z
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 2008-07-20T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2008-07-20T00:00:00Z, 050044, 17.56_20190403_1200. https://doi.org/10.5270/esa-1tfcekw