X-Raying Stellar Winds in a High-Speed Collision


Two massive stars racing in orbit around each other have had their colliding stellar winds X-rayed for the first time, thanks to the combined efforts of ESA’s XMM-Newton and NASA’s Swift space telescopes.

Stellar winds, pushed away from a massive star’s surface by its intense light, can have a profound influence on their environment.

Now, XMM-Newton and Swift have found a ‘Rosetta stone’ for such winds in a binary system known as Cyg OB2 #9, located in the Cygnus star-forming region, where the winds from two massive stars orbiting around each other collide at high speeds.

“This is the first time that we have found clear evidence for colliding winds in this system,” says Yael Nazé of the Université de Liège, Belgium, and lead author of the paper describing the results reported in Astronomy & Astrophysics.

Full Story: http://www.esa.int/esaSC/SEM3H93S18H_index_0.html
Also: http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=50904

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