Chemical abundances of fast-rotating massive stars. I. Description of the methods and individual results

[en] Aims: Recent observations have challenged our understanding of rotational mixing in massive stars by revealing a population of fast- rotating objects with apparently normal surface nitrogen abundances. However, several questions have arisen because of a number of issues, which have rendered a reinvestigation necessary; these issues include the presence of numerous upper limits for the nitrogen abundance, unknown multiplicity status, and a mix of stars with different physical properties, such as their mass and evolutionary state, which are known to control the amount of rotational mixing. Methods: We have carefully selected a large sample of bright, fast-rotating early-type stars of our Galaxy (40 objects with spectral types between B0.5 and O4). Their high-quality, high-resolution optical spectra were then analysed with the stellar atmosphere modelling codes DETAIL/SURFACE or CMFGEN, depending on the temperature of the target. Several internal and external checks were performed to validate our methods; notably, we compared our results with literature data for some well-known objects, studied the effect of gravity darkening, or confronted the results provided by the two codes for stars amenable to both analyses. Furthermore, we studied the radial velocities of the stars to assess their binarity. Results: This first part of our study presents our methods and provides the derived stellar parameters, He, CNO abundances, and the multiplicity status of every star of the sample. It is the first time that He and CNO abundances of such a large number of Galactic massive fast rotators are determined in a homogeneous way.

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 > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie

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)

Semaan, Thierry; Observatoire de Genève, Université de Genève > Stellar Variability

Daflon, Simone; Observatório Nacional > Coordenação de Astronomia e Astrofísica > Astrofísica Estelar

Oey, Marion Sally; University of Michigan > Department of Astronomy

Language :

English

Title :

Chemical abundances of fast-rotating massive stars. I. Description of the methods and individual results

Publication date :

July 2017

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

603

Issue :

A56

Peer reviewed :

Peer Reviewed verified by ORBi

Tags :

CÉCI : Consortium des Équipements de Calcul Intensif

Funders :

PRODEX XMM, ARC grant for concerted research actions financed by the French community of Belgium (Wallonia-Brussels Federation)

Available on ORBi :

since 23 October 2017

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