Space and Ground Based Pulsation Data of Eta Bootis Explained with Stellar Models Including Turbulence

Abstract

The space telescope MOST is now providing us with extremely accurate low frequency p-mode oscillation data for the star Eta Boo. We demonstrate in this paper that these data, when combined with ground based measurements of the high frequency p-mode spectrum, can be reproduced with stellar models that include the effects of turbulence in their outer layers. Without turbulence, the l=0 modes of our models deviate from either the ground based or the space data by about 1.5-4.0 micro Hz. This discrepancy can be completely removed by including turbulence in the models and we can exactly match 12 out of 13 MOST frequencies that we identified as l=0 modes in addition to 13 out of 21 ground based frequencies within their observational 2 sigma tolerances. The better agreement between model frequencies and observed ones depends for the most part on the turbulent kinetic energy which was taken from a 3D convection simulation for the Sun.

13 pages, 7 figures, ApJ in press

References in corpus (7)

• Stellar Turbulent Convection: A Selfconsistent Model
• 3D convection simulations of the outer layers of the Sun using realistic physics
• New seismological results on the G0 IV eta Bootis
• Confirmation of solar-like oscillations in eta Bootis
• VLTI/VINCI diameter constraints on the evolutionary status of delta Eri, xi Hya, eta Boo
• Inclusion of turbulence in solar modeling
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• On the interpretation of echelle diagrams for solar-like oscillations. Effect of centrifugal distortion
• Variation of Stellar Envelope Convection and Overshoot with Metallicity
• Measurement of the Surface Gravity of $\eta$ Boo
• Asteroseismology across the HR diagram
• Comparing the Effect of Radiative Transfer Schemes on Convection Simulations
• Convection and oscillations
• Entropy in adiabatic regions of convection simulations
• Fundamental stellar parameters of benchmark stars from CHARA interferometry -- III. Giant and subgiant stars
• Recent Advances in Modeling Stellar Interiors
• Current Issues in Asteroseismology