English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We report on the abundances of helium, carbon, nitrogen and oxygen in alarger sample of Galactic massive stars of ~7-20 M_sun near the main sequence,composed of apparently normal objects, pulsators of beta-Cephei- and SPB-type,and magnetic stars. High-quality spectra are homogeneously analysed usingsophisticated non-LTE line-formation and comprehensive analysis strategies. Allthe stars follow a previously established tight trend in the N/C-N/O ratio andshow normal helium abundances, tracing the nuclear path of the CNO-cyclesquantitatively. A correlation of the strength of the mixing signature with thepresence of magnetic fields is found. In conjunction with low rotationvelocities this implies that magnetic breaking is highly efficient for thespin-down of some massive stars. We suggest several objects for follow-upspectropolarimetry, as the mixing signature indicates a possible magneticnature of these stars.

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