ORBi: Nazé Yaël - The latest developments on Of?p stars

Reference : The latest developments on Of?p stars


	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/2268/97152

Title :	The latest developments on Of?p stars
Language :	English
Author, co-author :	Nazé, Yaël [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique observationnelle (sol et espace)]
	ud-Doula, Asif [Penn State Worthington Scranton, USA]
	Spano, Maxime [Obs. Genève, Switzerland]
	Rauw, Grégor [FNRS-ULg, Dept AGO, Allée du 6 Août 17, Bât B5C, B4000-Liège, Belgium,]
	De Becker, Michaël [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)]
	Walborn, Nolan R [STScI, USA]
Publication date :	1-Jul-2011
Main document title :	Active OB stars: structure, evolution, mass loss and critical limits
Alternative title :	[en] Proceedings IAU Symposium no. 272
Editor :	Neiner, Coralie
	Wade, G.
	Meynet, G.
	Peters, G.
Pages :	626-627
On invitation :	No
Audience :	International
Keywords :	[en] X-rays: stars ; stars: early-type ; stars: individual (HD 108 ; HD 148937 ; HD 191612) ; stars: emission-line
Abstract :	[en] In recent years several in-depth investigations of the three prototypical Of?p stars were undertaken, revealing their peculiar properties. To clarify some of the remaining questions, we have continued our monitoring of the prototypical Of?p trio. HD 108 has now reached its quiescent, minimum-emission state, for the first time in 50-60yrs, while new echelle spectra of HD 148937 confirm the presence in several H and He lines of the 7d variations detected previously only in the Hα line. A new XMM observation of HD 191612 clearly shows that its X-ray emission is not modulated by the orbital period of 1542d, but the high-energy variations are rather compatible with the 538d period of the optical changes - it is thus not of colliding-wind origin but linked to the phenomena responsible for the spectral/photometric variations, though our current MHD simulations remain at odds with the observational properties.
Permalink :	http://hdl.handle.net/2268/97152
DOI :	10.1017/S1743921311011628
Other URL :	http://adsabs.harvard.edu/abs/2011IAUS..272..626N

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