Evolution of the rotational properties and nitrogen surface abundances of B-Type stellar populations

GRANADA, A.; MEYNET, G.; EKSTRÖM, S.; GEORGY, C.; HAEMMERLÉ, L.

Ginebra

Simposio; IAU Symposium 307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry,; 2014

IAU - Universidad de Ginebra

Stellar evolution models predict that rotation induces the mixing ofchemical species, with the subsequent surface abundance anomaliesrelative to single non-rotating models, even during the main sequence(MS) evolution. The lack of measurable nitrogen surface enrichment in MSrotating stars, such as Be stars, has been interpreted as being inconflict with evolutionary models (e.g. Lennon et al. 2005; Hunter etal. 2008). In order to have an insight on the kind of ambient we do orwe do not expect to find enriched rotating stars, we use our newpopulation synthesis code, to produce synthetic intermediate-massstellar populations fully accounting for stellar rotation effects, andstudy their evolution in time.