Unpublished conference/Abstract (Scientific congresses and symposiums)
The X-ray properties of lambda Cep, a true twin of zeta Pup?
Rauw, Grégor; Nazé, Yaël; Gonzalez-Perez, Nicolas et al.
2014The X-ray Universe 2014
 

Files


Full Text
lambdaCep.pdf
Author preprint (1.59 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
massive stars; X-rays
Abstract :
[en] Oef stars are O-stars that display a double-peaked He II λ 4686 line in their optical spectra, suggesting that the inner part of the stellar wind is co-rotating with the star. This hypothesis is also often used to explain their ubiquitous spectral variability in the optical domain. In this context, the fact that the high-resolution X-ray spectra of ζ Pup (O4Ief) meet the expectations of the wind-embedded shock model, assuming a spherically symmetric wind came as a surprise. To understand what is going on, we have obtained a 300 ksec observation of λ Cephei, the second brightest Oef star. This observation not only allows to collect the RGS high-resolution spectrum of the star, but further enables us to search for X-ray variability. To correlate the potential X-ray variability with that of the optical spectrum of λ Cep, we monitored the optical spectrum simultaneously with the TIGRE telescope. We present here the first results of this campaign, both in terms of the line profiles in the RGS spectrum and the search for X-ray variability in correlation with the optical variations.
Research center :
LiSRI - Liège Space Research Institute - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rauw, Grégor  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Nazé, Yaël  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Gonzalez-Perez, Nicolas
Hempelmann, Alexander
Mittag, Marco
Schmitt, Jürgen
Schröder, Klaus-Peter
Hervé, Anthony
Eenens, Philippe
Gosset, Eric ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Language :
English
Title :
The X-ray properties of lambda Cep, a true twin of zeta Pup?
Publication date :
June 2014
Event name :
The X-ray Universe 2014
Event organizer :
European Space Agency
Event place :
Dublin, Ireland
Event date :
16-19 June 2014
Audience :
International
Available on ORBi :
since 20 June 2014

Statistics


Number of views
22 (2 by ULiège)
Number of downloads
71 (1 by ULiège)

Bibliography


Similar publications



Contact ORBi