GT- HD 108 is a puzzling star of spectral type O7fpe, considered to be atransition object between an O star and the next step of evolution (LBV,WR).We plan to investigate the X-ray variability from what is believed to be a nonspherical wind and to obtain high quality spectra of the star to search for thesignature of an advanced evolutionary stage in its chemical composition.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2002-08-21T03:37:07Z/2002-08-21T13:48:32Z
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, Prof Keith Mason, 2003, 'HD108: a puzzling transition object', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-7eb3kc4
