|Title||The Fastest Stellar Winds as New Sources of Hard X-rays|
|Author||Dr Lidia Oskinova|
|Description||Wolf-Rayet stars of the oxygen subclass (WO) are massive stars in their terminal evolutionary stage short before exploding as supernova or GRB. We predict that WO stars emit hard X-rays. They posses the fastest stellar winds among all non-degenerate stars, with velocities of 2 per cent of the speed of light. Strong shocks should develop in these winds and heat the plasma to 100 MK, resulting in X-ray emission. We request a 75 ksec observation of the closest WO star, WR 142, to obtain EPIC spectra and measure the parameters of the hot plasma, as a stringent test for the theory of X-ray production in hot star winds. In addition, our FoV will comprise 16 neighbouring OB stars. With their X-ray spectra we will probe the causality behind the correlation between bolometric and X-ray luminosity.|
|Publication||Discovery of X-Ray Emission from the Wolf-Rayet Star WR 142 of Oxygen Subtype . Oskinova, L. M., Hamann, W.-R., et all. . ApJ . 693-44 . 2009 . 2009ApJ...693L..44O ,
Hard X-Ray Emission in the Star-Forming Region ON 2: Discovery with XMM-Newton . Oskinova, L. M., Gruendl, R. A., et all. . ApJ . 712-763 . 2010 . 2010ApJ...712..763O ,
Exospheric solar wind charge exchange as seen by XMM-Newton . Carter, J. A., Semba, S., . AN . 333-313 . 2012 . 2012AN....333..313C ,
Classification of X-Ray Sources in the XMM-Newton Serendipitous Source Catalog . Lin, Dacheng, Webb, Natalie A., . ApJ . 756-27 . 2012 . 2012ApJ...756...27L ,
The diversity of quasars unified by accretion and orientation . Shen, Yue, Ho, Luis C., . Natur . 513-210 . 2014 . 2014Natur.513..210S ,
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift . Yershov, V. N., . Ap&SS . 354-97 . 2014 . 2014Ap&SS.354...97Y ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Chandra Observations of the Massive Star-forming Region Onsala 2 . Skinner, Stephen L., Sokal, Kimberly R., . ApJ . 871-116 . 2019 . 2019ApJ...871..116S ,
|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, 2009-06-28T00:00:00Z, 055022, 17.56_20190403_1200. https://doi.org/10.5270/esa-nx8i1ny|