A small group of early Be stars (the class of Gamma Cas analogs) exhibit lowluminosity hard X-ray emission with Log(Lx) virgul 32-33 erg/s. Both a white dwarfaccreting from the circumstellar disc or magnetic interaction between thephotosphere and the disc can explain the unusually hard X-ray emission. Thetarget of the proposal, HD 110432, is after Gamma Cas itself, the X-raybrightest member of this group and furthermore displays more markedcharacteristics of this class than the prototype. We propose to obtain a RGSspectrum of HD 110432 in order to constrain the X-ray emission mechanism usingemission line disgnostics, investigate the effect of a different discinclination, search for abundances anomalies and look for stable periodicities.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2007-09-04T14:55:16Z/2007-09-05T16:14:46Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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.
European Space Agency, Dr Christian Motch, 2008, 'Origin of the hard X-ray emission in Gamma Cas analogs: HD 110432', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-jlxxsng
