|Title||Exploring the X-ray emission of G-type giants spun up by accretion|
|Author||Dr Kevin Briggs|
|Description||Fast-rotation (v sin i of over 20 km-s) is rare among yellow (G2-K1) giants, restricted to tidally-synchronized binary components and the handful of FK Com- class single stars. Such stars have X-ray luminosities and plasma temperatures among the highest of known coronal sources. A number of yellow giants with v = 100 km-s have been found as companions to hot subdwarfs. These stars have been spun up by accretion of material from the companion during its AGB phase. We find the X-ray emission of the optically-brightest example to be an order of magnitude lower than that of FK Com stars. We propose to observe the only two bright comparable systems to discover whether such a surprisingly inefficient magnetic dynamo is a general outcome of accretive spin-up.|
|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, 2007-02-10T00:00:00Z, 030564, 17.56_20190403_1200. https://doi.org/10.5270/esa-mxludos|