Constraints on rotational mixing from surface evolution of light elements in massive stars

  title={Constraints on rotational mixing from surface evolution of light elements in massive stars},
  author={Urs Frischknecht and Raphael Hirschi and Georges Meynet and Sylvia Ekstrom and Cyril Georgy and Thomas Rauscher and Christian Winteler and Friedrich-Karl Thielemann},
  journal={Astronomy and Astrophysics},
Context. Light elements and nitrogen surface abundances together can constrain the mixing e ciencies in massive stars on the main sequence, because moderate mixing in the surface layers leads to depletion of light elements but only later to enrichment in nitrogen. Aims. We want to test the rotational mixing prescriptions included in the Geneva stellar evolution code (GENEC) by following the evolution of surface abundances of light isotopes in massive stars. Methods. The GENEC is a 1D code… 
Non-standard s process in low metallicity massive rotating stars
Context. Rotation is known to affect the nucleosynthesis of light elements in massive stars, mainly by rotation-induced mixing. In particular, rotation boosts the primary nitrogen production. Models
Enhancement of surface helium abundance in intermediate-mass main-sequence stars
The evolution of rapidly rotating 8, 4, and 2 M⊙ main-sequence stars is considered together with hydrodynamical transfer in their interiors. The conditions under which turbulent erosion,
Rotation and magnetism in massive stars
Rotation has a number of important effects on the evolution of stars. It decreases the surface gravity, causes enhanced mass loss and leads to surface abundance anomalies of various chemical
Evolution and Nucleosynthesis of Very Massive Stars
In this chapter, after a brief introduction and overview of stellar evolution, we discuss the evolution and nucleosynthesis of very massive stars (VMS: M>100 solar masses) in the context of recent
Lithium and oxygen in globular cluster dwarfs and the early disc accretion scenario
A new scenario --early disc accretion-- has been recently proposed to explain the discovery of multiple stellar populations in Galactic globular clusters. According to this model, the existence of
Lithium in Stellar Atmospheres: Observations and Theory
Of all the light elements, lithium is the most sensitive indicator of stellar evolution. This review discusses current data on the abundance of lithium in the atmospheres of A-, F-, G-, and K-stars
Imprints of fast-rotating massive stars in the Galactic Bulge
A reanalysis of the earlier spectra reveals that Y and Sr are also overabundant with respect to Fe, showing a large scatter similar to that observed in extremely metal-poor stars, whereas C abundances are not enhanced.
Links between surface magnetic fields, abundances, and surface rotation in clusters and in the field
  • N. Przybilla
  • Physics
    Proceedings of the International Astronomical Union
  • 2014
Abstract Theory predicts that hydrodynamical instabilities transport angular momentum and chemical elements in rotating massive stars. An interplay of rotation and a magnetic field affects these
Pre-supernova Evolution and Nucleosynthesis in Massive Stars and Their Stellar Wind Contribution
In this chapter, we review the modelling and pre-supernova evolution of massive stars with a particular emphasis on the effects of rotation and mass loss. We then present the stellar wind
Period Change and Stellar Evolution of β Cephei Stars
The $\beta$ Cephei stars represent an important class of massive star pulsators probing the evolution of B-type stars and the transition from main sequence to hydrogen-shell burning evolution. By


The VLT-FLAMES Survey of massive stars: Rotation and nitrogen enrichment as the key to understanding massive star evolution
Rotation has become an important element in evolutionary models of massive stars, specifically via the prediction of rotational mixing. Here we study a sample of stars, including rapid rotators, to
Presupernova Evolution of Rotating Massive Stars. II. Evolution of the Surface Properties
We investigate the evolution of the surface properties of models for rotating massive stars, i.e., their luminosities, effective temperatures, surface rotational velocities, and surface abundances of
Testing rotational mixing predictions with new boron abundances in main-sequence B-type stars
New boron abundances for seven main-sequence B-type stars are determined from HST STIS spectroscopy around the B III 2066 A line. Boron abundances provide a unique and critical test of stellar
The VLT-FLAMES survey of massive stars: constraints on stellar evolution from the chemical compositions of rapidly rotating Galactic and Magellanic Cloud B-type stars
Aims. We have previously analysed the spectra of 135 early B-type stars in the Large Magellanic Cloud (LMC) and found several groups of stars that have chemical compositions that conflict with the
We derive the effective temperatures and gravities of 461 OB stars in 19 young clusters by fitting the H gamma profile in their spectra. We use synthetic model profiles for rotating stars to develop
Stellar evolution with rotation XI. Wolf-Rayet star populations at different metallicities
Grids of models of massive stars (M ≥ 20 M� ) with rotation are computed for metallicities Z ranging from that of the Small Magellanic Cloud (SMC) to that of the Galactic Centre. The hydrostatic
Nitrogen enrichment, boron depletion and magnetic fields in slowly-rotating B-type dwarfs
Evolutionary models for massive stars, accounting for rotational mixing effects, do not predict any core-processed material at the surface of B dwarfs with low rotational velocities. Contrary to
Stellar evolution with rotation X: Wolf-Rayet star populations at solar metallicity
We examine the properties of Wolf-Rayet (WR) stars predicted by models of rotating stars taking account of the new mass loss rates for O-type stars and WR stars (Vink et al. 2000. 2001; Nugis &
Stellar evolution with rotation XII. Pre-supernova models
We describe the latest developments of the Geneva stellar evolution code in order to model the pre-supernova evolution of rotating massive stars. Rotating and non-rotating stellar models at solar
Light elements in massive single and binary stars
Abstract We highlight the role of the light elements (Li, Be, B) in the evolution of massive single and binary stars, which is largely restricted to a diagnostic value, and foremost so for the