It is not known whether the large photospheric polar spots found in many highlyactive stars have a counterpart in their corona or chromosphere. Our target, ERVul, is a short-period eclipsing binary harbouring two highly active G-dwarfs.During eclipse, only the polar regions of the component stars are occulted. Wepropose to study the corona and chromosphere of both components of ER Vul usingXMM-Newton light curves covering a complete orbit of ER Vul, i.e. one primaryand one secondary eclipse. The X-ray light curves will yield a spatial samplingof the polar coronae of both component stars, while the OM light curve willyield simultanous chromospheric information. Based on the proposed observations,we will assess, whether coronal and chromospheric polar spots exist on ER Vul.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2016-04-22T13:33:58Z/2016-04-23T10:52:18Z
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, Dr Uwe Wolter, 2017, 'Do coronal polar spots existquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ms1lgo4
