Poster (Scientific congresses and symposiums)
Chemical abundances of fast-rotating OB stars
Cazorla, Constantin; Morel, Thierry; Nazé, Yaël et al.
2014IAU Symposium 307 : New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry
 

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Keywords :
Massive stars abundances; Fundamental parameters; Rotation
Abstract :
[en] Fast rotation in massive stars is predicted to induce mixing in their interior, but recent observations have challenged this concept by revealing a population of fast-rotating stars with normal nitrogen abundances at their surface (Hunter et al. 2009, A&A, 496, 841; Brott et al. 2011, A&A, 530, A116, but see Maeder et al. 2014, A&A, 565, A39). However, as the binary fraction of these stars is unknown, the importance of mass-transfer processes cannot be quantified. As a result, no definitive statements about the ability of single-star evolutionary models including rotation to reproduce these observations can be made. Our work combines for the first time a detailed surface abundance analysis with a radial-velocity monitoring for a sample of bright, fast-rotating Galactic OB stars to put strong constraints on stellar evolutionary and interior models.
Research center :
LiSRI - Liège Space Research Institute - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Cazorla, Constantin ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Morel, Thierry  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Nazé, Yaël  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Language :
English
Title :
Chemical abundances of fast-rotating OB stars
Publication date :
23 June 2014
Event name :
IAU Symposium 307 : New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry
Event organizer :
University of Geneva
Event place :
Geneva, Switzerland
Event date :
23-27 June 2014
Audience :
International
Name of the research project :
Abundances of fast-rotating massive stars
Funders :
ARC grant financed by the Federation Wallonia-Brussels.
Available on ORBi :
since 27 August 2014

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