Excitation of gravity waves in common envelopes

Details Excitation of gravity waves in common envelopes Excitation of gravity waves in common envelopes

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..185s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 1, p. 185-191.

Statistics

Computation

4

Asymptotic Giant Branch Stars, Binary Stars, Brown Dwarf Stars, Gravity Waves, Stellar Envelopes, Wave Excitation, Computational Astrophysics, Momentum Transfer, Stellar Cores, Stellar Evolution, Stellar Mass, Wave Propagation

Scientific paper

We study the excitation of gravity waves by a low-mass companion orbiting inside the envelope of a giant star, concentrating on brown dwarfs inside the envelope of asymptotic giant branch stars. Efficient g-wave excitations occur only after the brown dwarf has spiraled-in to the radiative zone, well inside the envelope, of the asymptotic giant branch star. The brown dwarf excites g-waves when its orbital radius is about 3-10 solar radii. At this stage of the evolution the envelope mass is below 0.1 solar mass. The g-waves propagate inward from the secondary orbit, carrying angular momentum and energy. We find that the angular momentum transport leads to an efficient spin-up of the inner envelopes. The differential rotation between the envelope and core and nonlinear wave effects, can cause a mixing of heavy elements from the core to the envelope.

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