| Near-Surface Effects in Modelling Oscillations of . . . (2007) | |||||||||||||
Abstract | |||||||||||||
| -pressure perturbation. HYD.a Outer structure obtained from horizontal and temporal averaging of a hydrodynamical convection model (e.g. Stein & Nordlund 1991). This was extended into a deep-envelope model through continuous matching at the lower boundary of the hydrodynamical model. Frequencies computed in the adiabatic approximation. We compared the radial oscillation frequencies computed from these sophisticated models with those of normal models whose (local) mixing length was 1 NL.aNL.a NL.na - NL.a NL.na HYD.a adjusted to obtain the same convection zone depth. The comparisons are shown in the figure, in the sense (sophisticated treatment) \Gamma (normal treatment). Note that oscillations in j Boo were observed in the frequency range 750--950Hz. Two effects influence the frequencies: (i) Changes in the equilibrium model structure. It can be shown that these are dominated by the inclusion of tur | |||||||||||||
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