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The XMM-Newton view of Plaskett's star and its surroundings
Linder, N.; Rauw, Grégor
2005In Massive Stars and High-Energy Emission in OB Associations
 

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Abstract :
[en] XMM data of Plaskett's star (HD 47129) are used in order to analyse its X-ray spectrum and variability and hence to derive further constraints on the wind interaction in this early-type binary (O6 I + O7.5 I) system. Combining the information provided by the EPIC and RGS instruments, we find that the X-ray spectrum of Plaskett's star is dominated by thermal plasma at lower energies, whereas the higher energy part (> 3 keV) could probably best be represented by a featureless power law component since we do not detect a significant Fe-K line. Our tests also suggest that an overabundance in nitrogen by a factor Ë 6 might be indicated to best represent the RGS spectrum. On the other hand, 71 X-ray sources have been detected in Plaskett's star field of view and most of them have counterparts in near-IR colours that are consistent with slightly reddened main-sequence objects. Actually, a sizeable fraction of the X-ray sources in the EPIC images could be either foreground or background sources with no direct connection to HD 47129.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Linder, N.;  Institut d'Astrophysique et de Géophysique, Université de Liège, Belgium) AB(Institut d'Astrophysique et de Géophysique, Université de Liège, Belgium
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 :
The XMM-Newton view of Plaskett's star and its surroundings
Publication date :
01 November 2005
Audience :
International
Main work title :
Massive Stars and High-Energy Emission in OB Associations
Pages :
53-56
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