|Title||Coronae of A-type Stars: Does Dust Play a Role?|
|Author||Dr Carl Melis|
|Description||A-type stars are not expected to be sites of vigorous stellar magnetic activity phenomena like chromospheric or coronal emissions and hence should be X-ray dark. With a few exceptions, this expectation is borne out in observations. However, in investigating those A-type stars with X-ray emission where a lower-mass companion is not to blame, we have discovered a tentative connection between the presence of near-infrared excess emission (indicating very close-in orbiting dust) and detected X-ray emission. In this proposal we seek to further vet this with XMM-Newton observations that will yield a statistical sample of X-ray characterized A-type stars with and without near-infrared excess emission.|
|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, 2020-12-13T23:00:00Z, 084315, 17.56_20190403_1200. https://doi.org/10.5270/esa-1bm7vqv|