|Title||Origin of the X-ray emission in the He-rich luminous subdwarf BD +37 442|
|Author||Dr Sandro MEREGHETTI|
|Description||BD +37 442 is one of the very few hot subdwarf stars detected in the X-ray range. The observed X-rays could arise either from accretion onto a neutron star or white dwarf companion (as suggested by the possible presence of X-ray pulsations at P=19.2 s) or from intrinsic emission of the hot subdwarf itself. Both possibilities are interesting because they offer the possibility to investigate the poorly known properties of radiation driven winds at the low mass-loss rates present in hot subdwarfs. A new observation is required to confirm or reject the pulsations and to better constrain the spectral properties.|
|Publication||The lack of X-ray pulsations in the extreme helium star BD+37442 and its possible stellar wind X-ray emission . Mereghetti, Sandro, La Palombara, Nicola, et all. . MNRAS . 466-2918 . 2017 . 2017MNRAS.466.2918M ,
News on the X-ray emission from hot subdwarf stars . Palombara, Nicola La, Mereghetti, Sandro, . OAst . 26-187 . 2017 . 2017OAst...26..187P ,
|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, 2017-02-16T23:00:00Z, 076455, 17.56_20190403_1200. https://doi.org/10.5270/esa-kx7p4f9|