|Title||ARE MAGNETIC EARLY-TYPE STARS INTRINSIC X-RAY EMITTERS?|
|Author||Dr STEPHEN DRAKE|
|Description||We propose to observe 2 magnetic early-type stars (56 Tau and nu Sco CD) that were previously detected as X-ray sources by ROSAT and as nonthermal radio sources by the VLA, so as to obtain well-exposed EPIC spectra and lightcurves. We will analyze their spectra for evidence for or against the hypothesis that the X-ray emitting plasma is intrinsic to the magnetic star (as opposed to being coronal emission from unresolved low-mass stellar companions), e.g., by comparing the inferred coronal elemental abundances to the peculiar Si-rich abundances of the magnetic stars. photospheres. We will also study the X-ray lightcurves of the 2 stars compared to their magnetic field variations and to their simultaneous radio light curves as a further test of the intrinsic vs. extrinsic hypothesis.|
|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, 2005-05-01T00:00:00Z, 020136, 17.56_20190403_1200. https://doi.org/10.5270/esa-8av6ebq|