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X-ray emission of interacting wind binaries in Cyg OB2

  • Y. Nazé (a1), C. Cazorla (a1) and G. Rauw (a1)

Abstract

Cyg OB2 #5, #8A, and #9 are binary or multiple massive stars in the Cyg OB2 association displaying several peculiarities, such as bright X-ray emission and non-thermal radio emission. Our X-ray monitoring of these stars reveals the details of their behaviours at high energies, which can be directly linked to wind-wind collisions (WWCs). In addition, the X-ray emission of Cyg OB2 #12, an evolved massive star, shows a long-term decrease, which could hint at the presence of a companion (with associated colliding winds) or indicate the return to quiescence of the star following a recent eruption.

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[1]1Blomme, R., De Becker, M., Volpi, D., & Rauw, G., 2010, A&A, 519, A111
[2]2Cazorla, C., Nazé, Y., Rauw, G., 2013, A&A, submitted
[3]3Clark, J.S., Najarro, F., Negueruela, I., et al, 2012, A&A, 541, A145
[4]4De Becker, M., Rauw, G., Sana, H., et al, 2006, MNRAS, 371, 1280
[5]5Nazé, Y., Mahy, L., Damerdji, Y., et al, 2012, A&A, 546, A37
[6]6Pittard, J.M., & Parkin, E.R., 2010, MNRAS, 403, 1657

X-ray emission of interacting wind binaries in Cyg OB2

  • Y. Nazé (a1), C. Cazorla (a1) and G. Rauw (a1)

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