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Mixing of CNO-cycled matter in pulsationally and magnetically active massive stars

Published online by Cambridge University Press:  12 July 2011

Norbert Przybilla  and
Maria-Fernanda Nieva
Norbert Przybilla
Affiliation:
Dr. Remeis-Observatory & ECAP, Sternwartstr. 7, D-96049 Bamberg, Germany email: przybilla@sternwarte.uni-erlangen.de
Maria-Fernanda Nieva
Affiliation:
Max-Planck-Institut für Astrophysik, Postfach 1317, D-85741 Garching, Germany email: fnieva@mpa-garching.mpg.de
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Abstract

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We report on the abundances of helium, carbon, nitrogen and oxygen in a larger sample of Galactic massive stars of ~7-20 M⊙ near the main sequence, composed of apparently normal objects, pulsators of β-Cephei- and SPB-type, and magnetic stars. High-quality spectra are homogeneously analysed using sophisticated non-LTE line-formation and comprehensive analysis strategies. All the stars follow a previously established tight trend in the N/C-N/O ratio and show normal helium abundances, tracing the nuclear path of the CNO-cycles quantitatively. A correlation of the strength of the mixing signature with the presence of magnetic fields is found. In conjunction with low rotation velocities this implies that magnetic breaking is highly efficient for the spin-down of some massive stars. We suggest several objects for follow-up spectropolarimetry, as the mixing signature indicates a possible magnetic nature of these stars.

Keywords

stars: abundancesstars: activitystars: atmospheresstars: early-typestars: evolutionstars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 26 - 31
Copyright
Copyright © International Astronomical Union 2011

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