|Title||X-Ray Emission from Nitrogen-Rich Wolf-Rayet Stars|
|Author||Dr Stephen Skinner|
|Description||Wolf-Rayet (WR) stars are massive evolved stars approaching the end of their lives as supernovae. Previous studies have focused on X-ray bright WR+OB colliding wind binaries, but much less is known about the X-ray emission of single WR stars. We have initiated a survey of single (non-binary) nitrogen-rich (WN-type) stars aimed at determining their X-ray properties and identifying possible emission processes. We have recently detected X-rays from a WN2 and a WN6 star with Chandra and an observation of a WN4 star is pending. We propose here to use XMM EPIC to extend this exploratory survey to the later WN7 - WN9 spectral types, thus providing a first-look at X-ray properties across the full spectral sequence.|
|Publication||X-ray Emission from Nitrogen-Type Wolf-Rayet Stars . Skinner, Stephen L., Zhekov, Svetozar A., et all. . AJ . 139-825 . 2010 . 2010AJ....139..825S ,
New X-Ray Detections of WNL Stars . Skinner, Stephen L., Zhekov, Svetozar A., et all. . AJ . 143-116 . 2012 . 2012AJ....143..116S ,
Absence of hot gas within the Wolf-Rayet bubble around WR 16 . Toala, J. A., Guerrero, M. A., . A&A . 559-52 . 2013 . 2013A&A...559A..52T ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Chandra Detects the Rare Oxygen-type Wolf-Rayet Star WR 142 and OB Stars in Berkeley 87 . Sokal, Kimberly R., Skinner, Stephen L., et all. . ApJ . 715-1327 . 2010 . 2010ApJ...715.1327S ,
Is the Pollock.s paradigm of X-ray emission for O stars correct? . Ryspaeva, E. B., Kholtygin, A. F., . AN . 338-959 . 2017 . 2017AN....338..959R ,
The low-mass pre-main sequence population of Scorpius OB1 . Damiani, Francesco, . A&A . 615-148 . 2018 . 2018A&A...615A.148D ,
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, 2011-03-30T00:00:00Z, 060202, PPS_NOT_AVAILABLE. https://doi.org/10.5270/esa-17c2cer|