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The latest developments on Of?p stars
Nazé, Yaël; ud-Doula, Asif; Spano, Maxime et al.
2011In Neiner, Coralie; Wade, G.; Meynet, G. et al. (Eds.) Active OB stars: structure, evolution, mass loss and critical limits
 

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Keywords :
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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nazé, Yaël  ;  Université de Liège - ULiège > 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  ;  Université de Liège - ULiège > Dept AGO
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Walborn, Nolan R;  STScI, USA
Language :
English
Title :
The latest developments on Of?p stars
Publication date :
01 July 2011
Event name :
IAU Symposium no. 272
Event date :
19-23 July 2010
Audience :
International
Main work title :
Active OB stars: structure, evolution, mass loss and critical limits
Main work alternative title :
[en] Proceedings IAU Symposium no. 272
Editor :
Neiner, Coralie
Wade, G.
Meynet, G.
Peters, G.
Pages :
626-627
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