|Title||HD 109962: the Most Massive Dwarf Nova?|
|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|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|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|