|Title||A Study of the Middle-Aged Sun: beta Comae|
|Author||Dr Manuel Guedel|
|Description||We propose to obtain high-quality spectra of the middle-aged (1.6 Gyr) solar analog beta Comae. This observation will conclude a comprehensive X-ray spectroscopic study of the "X-Ray Sun in Time" with XMM-Newton, obtaining data from a star at the critical transition between magnetically active, rapidly rotating young stars and stars like the Sun. One of the main goals of this study is a deeper understanding of the coronal composition of solar analogs at different ages. For younger solar analogs, we find a systematic trend from underabundant elements with low first ionization potentials in very active stars to overabundances of the same elements in less active stars. Our target will allow us to extend this study to the complete main-sequence evolution of a solar-type star.|
|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, 2004-09-03T00:00:00Z, 014868, 17.56_20190403_1200. https://doi.org/10.5270/esa-ys946ic|