We propose to complete an in-depth study of the evolution of the corona of asolar-mass star over its main-sequence lifetime by observing with XMM a star (18Sco) with nearly identical physical properties to the Sun. One of the few starsremaining in the Sun in Time program that does not have X-ray measures is 18Sco, which has been identified as the Closest Ever Solar Twin (Porto de Mello& da Silva 1997). This nearby G2 V star has M_V, T_eff, Fe/H, R/R_0, inferredage and mass that are closely matched to the Sun. Also, it.smagnetically-related chromospheric activity is very similar to the Sun. 18 Scoprovides an important check on the behavior of our present Sun.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2005-08-26T04:47:19Z/2005-08-26T13:37:38Z
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 Edward Guinan, 2006, 'The X-ray Sun in Time: XMM Observations of the Solar Twin 18 Scorpii', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-sf204h9
