[en] We report on preliminary results of a multi-observatory investigation of the X-ray emission from the massive colliding wind binary Cyg OB2 #8A (O6If + O5.5III(f)). On the basis of our new XMM-Newton-EPIC observations, along with archive ASCA-SIS and ROSAT-PSPC data, we show strong evidence for a significant phase-locked variability of the X-ray emission from Cyg OB2 #8A with the period of 21.9 days determined by De Becker et al. (2004). These results lend further support to the colliding wind scenario that was already suggested by optical data (De Becker & Rauw 2005). We briefly discuss the behaviour of the X-ray emission from this binary system as a function of phase in the context of the colliding wind scenario.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
De Becker, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Language :
English
Title :
Evidence for phase-locked X-ray variations from the colliding-wind massive binary Cyg OB2 #8A
Publication date :
November 2005
Event name :
JENAM 2005, "Distant Worlds"
Event organizer :
Université de Liège, IAGL
Event place :
Liège, Belgium
Event date :
du 4 au 7 juillet 2005
Audience :
International
Main work title :
Massive Stars and High-Energy Emission in OB Associations