ORBi: De Becker Michaël - Evidence for phase-locked X-ray variations from the colliding-wind massive binary Cyg OB2 #8A

Reference : Evidence for phase-locked X-ray variations from the colliding-wind massive binary Cyg OB...


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/12055

Title :	Evidence for phase-locked X-ray variations from the colliding-wind massive binary Cyg OB2 #8A
Language :	English
Author, co-author :	De Becker, Michaël [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
	Rauw, Grégor [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
Publication date :	Nov-2005
Main document title :	Massive Stars and High-Energy Emission in OB Associations
Editor :	Rauw, G.
	Nazé, Y.
	Blomme, R.
	Gosset, E.
Pages :	73-76
Peer reviewed :	No
On invitation :	No
Audience :	International
Event name :	JENAM 2005, "Distant Worlds"
Event date :	du 4 au 7 juillet 2005
Event organizer :	Université de Liège, IAGL
Event place (city) :	Liège
Event country :	Belgique
Keywords :	[en] Stars: early-type ; stars : individual : Cyg OB2 #8A ; X-rays
Abstract :	[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.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/12055
Other URL :	http://adsabs.harvard.edu/abs/2005mshe.work...73D

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