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Amplitudes of solar-like oscillations in red giants: Departures from the quasi-adiabatic approximation
- Source :
- EPJ Web of Conferences, Vol 43, p 03008 (2013)
- Publication Year :
- 2013
- Publisher :
- EDP Sciences, 2013.
-
Abstract
- CoRoT and Kepler measurements reveal us that the amplitudes of solar-like oscillations detected in red giant stars scale from stars to stars in a characteristic way. This observed scaling relation is not yet fully understood but constitutes potentially a powerful diagnostic about mode physics. Quasi-adiabatic theoretical scaling relations in terms of mode amplitudes result in systematic and large differences with the measurements performed for red giant stars. The use of a non-adiabatic intensity-velocity relation derived from a non-adiabatic pulsation code significantly reduces the discrepancy with the CoRoT measurements. The origin of the remaining difference is still unknown. Departure from adiabatic eigenfunction is a very likely explanation that is investigated in the present work using a 3D hydrodynamical model of the surface layers of a representative red giant star.
Details
- Language :
- English
- ISSN :
- 2100014X
- Volume :
- 43
- Database :
- Directory of Open Access Journals
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.013de1aab73748bba710c9bda9da1022
- Document Type :
- article
- Full Text :
- https://doi.org/10.1051/epjconf/20134303008