We propose to study elemental fractionation between the photosphere and thecorona in stars with super-solar abundances, and their dependence on the FirstIonization Potential (FIP). Currently, coronal abundances have been measured foronly 3 stars with average metallicity of A Z /A H > 0.3. We propose toobserve 5 additional metal rich stars in order to understand whether highatmospheric abundances affect coronal composition. The immediate goal of theproposed observations is to determine the coronal enrichment and depletionfactor(s) for confirmed high-metallicity stars, compare them with thosepreviously found for stars with solar abundances and measure (or exclude) thedependence of the process(es) causing coronal fractionation on metallicity.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2016-09-30T15:38:09Z/2017-03-16T11:43:14Z
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 Ehud Behar, 2018, 'Dependence of Coronal Element Fractionation on Metallcity', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-c99zjdk
