|Title||A Search for Coronal Activity Among Metal-Poor Subdwarfs|
|Author||Prof Graeme Smith|
|Description||We propose to search for coronal soft x-ray emission from several of the oldest main sequence stars in the Galaxy. Our program stars have been pre-selected from ground-based observations to have He I 10830 Ang absorption lines with an equivalent width of 30 mA or more. If such stars follow a relation between He I equivalent width and soft x-ray flux applicable to Population I dwarf stars, then they would be expected to have x-ray luminosities 5e-7 times their bolometric luminosity, and as such would yield detectable sources in 20 ks exposures with the EPIC-pn camera on XMM-Newton. Our proposal seeks to push the detection of coronal activity to the lowest stellar metallicities yet surveyed, namely [Fe-H] virgul -2.0 dex.|
|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, 2016-04-14T22:00:00Z, 074168, 17.56_20190403_1200. https://doi.org/10.5270/esa-or8ofe8|