|Title||The X-ray emission of the sdO star BD+37 1977|
|Author||Mr Nicola La Palombara|
|Description||While several hot subdwarf stars have been deeply investigated in the optical and UV domain, up to very recent times only the sdO stars HD49798 and BD+37 442 had been detected at X-rays. Both sources are characterized by comparable spectral and timing properties; in particular, the flux shows a fast periodic modulation, likely due to wind accretion from the sdO star onto a WD or NS companion. In the latest months the first systematic search for X-ray emission from a complete flux-limited sample of sdO stars, performed by Chandra, has provided a detection also of the sdO star BD+37 1977. Now we propose to observe this star with XMM: our aim is to characterize in detail its spectral X-ray properties and to investigate if it is intrinsic or due to an accreting compact companion.|
|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, 2015-05-16T22:00:00Z, 074014, 17.56_20190403_1200. https://doi.org/10.5270/esa-zohp34t|