Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-04
Astrophys.J.640:1039-1050,2006
Astronomy and Astrophysics
Astrophysics
10 figures, 7 tables; accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/500252
(Abridged) New boron abundances for seven main-sequence B-type stars are determined from HST STIS spectroscopy around the BIII 2066A line. Boron abundances provide a unique and critical test of stellar evolution models that include rotational mixing since boron is destroyed in the surface layers of stars through shallow mixing long before other elements are mixed from the stellar interior through deep mixing. Boron abundances range from 12+log(B/H) = 1.0 to 2.2. The boron abundances are compared to the published values of their stellar nitrogen abundances (all have 12+log(N/H) < 7.8, i.e., they do not show significant CNO-mixing) and to their host cluster ages (4 to 16 Myr) to investigate the predictions from models of massive star evolution with rotational mixing effects (Heger & Langer 2000). Only three stars (out of 34) deviate from the model predictions, including HD36591, HD205021, and HD30836. These three stars suggest that rotational mixing could be more efficient than currently modelled at the highest rotation rates.
Brooks Alyson M.
Lambert David L.
Mendel Trevor J.
Proffitt Charles R.
Venn Kim A.
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