Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-29
Astrophys.J.647:L143-L146,2006
Astronomy and Astrophysics
Astrophysics
9 pages; 2 figures. ApJL Letters, in press
Scientific paper
10.1086/507301
We report on non-LTE Ne abundances for a sample of B-type stellar members of the Orion Association. The abundances were derived by means of non-LTE fully metal-blanketed model atmospheres and extensive model atoms with updated atomic data. We find that these young stars have a very homogeneous abundance of A(Ne) = 8.27 +/- 0.05. This abundance is higher by ~0.4 dex than currently adopted solar value, A(Ne)=7.84, which is derived from lines produced in the corona and active regions. The general agreement between the abundances of C, N, and O derived for B stars with the solar abundances of these elements derived from 3-D hydrodynamical models atmospheres strongly suggests that the abundance patterns of the light elements in the Sun and B stars are broadly similar. If this hypothesis is true, then the Ne abundance derived here is the same within the uncertainties as the value required to reconcile solar models with helioseismological observations.
Cunha Katia
Hubeny Ivan
Lanz Thierry
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