Angular momentum transport by internal gravity waves III - Wave excitation by core convection and the Coriolis effect

Abstract

This is the third in a series of papers that deal with angular momentum transport by internal gravity waves. We concentrate on the waves excited by core convection in a 3Msun, Pop I main sequence star. Here, we want to examine the role of the Coriolis acceleration in the equations of motion that describe the behavior of waves and to evaluate its impact on angular momentum transport. We use the so-called traditional approximation of geophysics, which allows variable separation in radial and horizontal components. In the presence of rotation, the horizontal structure is described by Hough functions instead of spherical harmonics. The Coriolis acceleration has two main effects on waves. It transforms pure gravity waves into gravito-inertial waves that have a larger amplitude closer to the equator, and it introduces new waves whose restoring force is mainly the conservation of vorticity. Taking the Coriolis acceleration into account changes the subtle balance between prograde and retrograde waves in non-rotating stars. It also introduces new types of waves that are either purely prograde or retrograde. We show in this paper where the local deposition of angular momentum by such waves is important.

9 pages, 10 figures, accepted for publication by A&A

References in corpus (6)

• The evolution of rotating stars
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• Hydrodynamical stellar models including rotation, internal gravity waves and atomic diffusion. I. Formalism and tests on Pop I dwarfs
• Angular momentum redistribution by waves in the Sun
• Angular momentum transport by gravity waves and its effect on the rotation of the solar interior
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• Multisite spectroscopic seismic study of the beta Cep star V2052 Oph: inhibition of mixing by its magnetic field
• Deep Mixing in Evolved Stars. II. Interpreting Li Abundances in RGB and AGB Stars
• Angular momentum redistribution by mixed modes in evolved low-mass stars. I. Theoretical formalism
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• Dynamical Tides in Compact White Dwarf Binaries: Influence of Rotation
• A model of rotating convection in stellar and planetary interiors: I - convective penetration
• A Pulsational Mechanism for Producing Keplerian Disks around Be Stars
• Transport processes in stars: diffusion, rotation, magnetic fields and internal waves
• Transport of angular momentum by stochastically excited waves as an explanation for the outburst of the rapidly rotating Be star HD49330
• Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars
• Angular momentum transport by stochastically excited oscillations in rapidly rotating massive stars
• Overstable Convective Modes in Rotating Early Type Stars
• Influence of Rotation on Stellar Evolution
• The traditional approximation of rotation for rapidly rotating stars and planets. I. The impact of strong deformation
• Viscous decretion discs around rapidly rotating stars
• Pulsation-driven mean zonal and meridional flows in rotating massive stars
• Co-existence of Internal Gravity Waves and Tayler-Spruit Magnetic Fields in the Radiative Core of Low-mass Stars