The Wolf-Rayet system HD 193793 is a wide binary classified as WC7 + O4-5with an orbital period of 7.94 years. HD 193793 emits the thin thermal X-ray emission from the colliding wind shock. The X-ray spectrum is alsoheavily absorbed below 2 keV by the Wolf-Rayet wind. We thus proposeRGS/XMM observation of HD 193793 in November 2001, 10 months after periastron passage. With the highspectroscopic capability of RGS, we expect to clearly detect neon K-lines and K-edge in the spectrum, which allow us tomeasure neon abundance for the first time. The neon abundance in W-R winds ishelpful to constrain the chemical evolution of massive stars and crucial to ourunderstanding of the Galaxy, the ISM and the cosmic-rays.
Instrument
RGS1, EPN, RGS2, EMOS1, OM, EMOS2
Temporal Coverage
2004-07-20T11:21:43Z/2004-07-21T20:36:35Z
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 Yoshitomo Maeda, 2006, 'RGS Abundance Measurement of Wolf-Rayet Stellar Wind', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-tdqk5r5
