|Title||Investigating the transitional nature of extreme O-type supergiants in X-rays|
|Author||Dr Michael De Becker|
|Description||We propose to investigate the X-ray properties of HD14947, an O5 supergiant believed to be a transition object between O and Wolf-Rayet stars. Stars belonging to this scarce category display several properties strongly pointing to their transitional status, including broad and strong emission lines in the visible and infrared, and the existence is some cases of surrounding nebulae similar to those existing close to WR stars. We request observation time with XMM-Newton to check whether the X-ray emission of HD14947 deviates significantly from the expected behaviour of regular O-type stars, as recently revealed by our team on the basis of an XMM-Newton observation of a similar object, attempting to establish an additional transition criterion in X-rays for evolved O-type stars.|
|Publication||The X-ray under-luminosity of the O-type supergiants HD 16691 and HD 14947 revealed by XMM-Newton . De Becker, M., . NewA . 25-7 . 2013 . 2013NewA...25....7D ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Analysis of the X-ray emission of OB stars: O stars . Ryspaeva, Elizaveta, Kholtygin, Alexander, . RAA . 18-104 . 2018 . 2018RAA....18..104R ,
|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, 2014-02-09T00:00:00Z, 069088, 17.56_20190403_1200. https://doi.org/10.5270/esa-vmlz8du|