|Title||Evolution and X-ray activity of the four Hyades giants|
|Author||Prof Juergen Schmitt|
|Description||The nearby Hyades cluster harbors four giants, which have almost identical optical appearances. However, the activity of these very similar stars differs, with two stars being active, while the stars HD28305 and HD27697 are inactive: The X-ray luminosities of these stars differ by more than a facor of 100! An evolutionary study shows the former two at the beginning of their helium burning phase, while the latter two have already developed a carbon-oxygen core. Detailed X-ray spectroscopy is available for the two bright giants, yet none for the two fainter giants, for which we propose deep XMM-Newton EPIC spectroscopy. We want to perform a detailed analysis of the X-ray spectra, search for spectral differences and relate them to the different states of activity and stellar evolution.|
|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, 2022-03-09T00:00:00Z, 086373, 18.02_20200221_1200. https://doi.org/10.5270/esa-[xxxxxxx]|