Amplitudes of solar-like oscillations: a new scaling relation
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Publication:4905707
DOI10.1051/0004-6361/201116789zbMATH Open1260.85057arXiv1104.1659OpenAlexW2142239297WikidataQ60715732 ScholiaQ60715732MaRDI QIDQ4905707
Publication date: 20 February 2013
Published in: Astronomy & Astrophysics (Search for Journal in Brave)
Abstract: Solar-like oscillations are excited by near-surface convection and are being observed in growing numbers of stars using ground and space-based telescopes. We have previously suggested an empirical scaling relation to predict their amplitudes (Kjeldsen and Bedding 1995). This relation has found widespread use but it predicts amplitudes in F-type stars that are higher than observed. Here we present a new scaling relation that is based on the postulate that the power in velocity fluctuations due to p-mode oscillations scales with stellar parameters in the same way as the power in velocity fluctuations due to granulation. The new relation includes a dependence on the damping rate via the mode lifetime and should be testable using observations from the CoRoT and Kepler missions. We also suggest scaling relations for the properties of the background power due to granulation and argue that both these and the amplitude relations should be applicable to red giant stars.
Full work available at URL: https://arxiv.org/abs/1104.1659
Galactic and stellar structure (85A15) Hydrodynamic and hydromagnetic problems in astronomy and astrophysics (85A30)
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