| Proposal ID | 050473 |
| Title | Origin of the hard X-ray emission in Gamma Cas analogs: HD 110432 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0504730101 |
| DOI | https://doi.org/10.5270/esa-jlxxsng |
| Principal Investigator, PI | Dr Christian Motch |
| Abstract | A small group of early Be stars (the class of Gamma Cas analogs) exhibit lowluminosity hard X-ray emission with Log(Lx) ~ 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. |
| Publications |
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| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2008-12-02T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "marked characteristics", "xray emission mechanism", "abundance anomalies", "hard xray emission", "circumstellar disc", "stable periodicities", "xray brightest", "emission line disgnostics", "magnetic interaction", "HD 110432", "hd 110432", "white dwarf accreting", "gamma cas analogs", "disc inclination", "gamma cas", "rgs spectrum" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | 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 |