Space‐ and Ground‐based Pulsation Data of η Bootis Explained with Stellar Models Including Turbulence

The space telescope MOST is now providing us with extremely accurate lowfrequency p-mode oscillation data for the star Eta Boo. We demonstrate in thispaper that these data, when combined with ground based measurements of the highfrequency p-mode spectrum, can be reproduced with stellar models that includethe effects of turbulence in their outer layers. Without turbulence, the l=0modes of our models deviate from either the ground based or the space data byabout 1.5-4.0 micro Hz. This discrepancy can be completely removed by includingturbulence in the models and we can exactly match 12 out of 13 MOST frequenciesthat we identified as l=0 modes in addition to 13 out of 21 ground basedfrequencies within their observational 2 sigma tolerances. The better agreementbetween model frequencies and observed ones depends for the most part on theturbulent kinetic energy which was taken from a 3D convection simulation forthe Sun.Comment: 13 pages, 7 figures, ApJ in pres