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Iron and nickel diffusion in subdwarf B stars | Haili Hu
; | Date: |
1 Sep 2011 | Abstract: | Pulsations in subdwarf B stars are attributed to radiative levitation of
iron-group elements in the stellar envelope. Until now, only iron diffusion is
accounted for in stellar models used for sdB seismology. However, nickel has
also been suggested as a contributor to the opacity bump that drives the
pulsation modes. Stellar models including time-dependent atomic diffusion, as
we compute here, are needed to evaluate the importance of different iron-group
elements for mode driving. We perform detailed calculations of radiative
accelerations of H, He, C, N, O, Ne, Mg, Fe and Ni and include these in
Burgers’ diffusion equations. We compute the evolution and non-adiabatic
pulsations of a typical subdwarf B star. We show that, despite its lower
initial abundance, nickel accumulates to comparable mass fractions as iron in
the sdB envelope. For accurate determination of pulsation frequencies and mode
instability, it is essential that diffusion of both metals are included in
stellar models. The role of other iron-group elements remain to be evaluated. | Source: | arXiv, 1109.0121 | Services: | Forum | Review | PDF | Favorites |
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