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Amplitudes of solar-like oscillations in red giants: Departures from the quasi-adiabatic approximation.
- Source :
- EPJ Web of Conferences; 2013, Issue 43, p03008-p.1-03008-p.10, 10p
- Publication Year :
- 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 intensityvelocity 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- RED giants
OSCILLATIONS
PHYSICS
VELOCITY
Subjects
Details
- Language :
- English
- ISSN :
- 21016275
- Issue :
- 43
- Database :
- Complementary Index
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Conference
- Accession number :
- 86427015
- Full Text :
- https://doi.org/10.1051/epjconf/20134303008