Seismic study of stellar convective cores

Abstract

It has been shown that a discontinuity in the derivatives of the sound speed at the edge of the convective regions inside a star gives rise to a characteristic oscillatory signal in the frequencies of stellar oscillations. This oscillatory signal has been suggested as a means to study the base of the outer convection zone in low mass stars and possibly the outer edge of the convective core in high mass stars. Using stellar models we show that because of a phenomenon similar to aliasing in Fourier transform, it may not be possible to use this signal to detect the convective core. Nevertheless, it may be possible to determine the size of convective cores using the frequency separation ν_{n+1,l}-ν_{n,l}.

Accepted for publication in A & A

References in corpus (2)

• Standard Solar models in the Light of New Helioseismic Constraints II. Mixing Below the Convective Zone
• Seismic detection of stellar tachoclines

Cited by in corpus (29)

• Stellar ages and convective cores in field main-sequence stars: first asteroseismic application to two Kepler targets
• Measurement of acoustic glitches in solar-type stars from oscillation frequencies observed by Kepler
• Evidence for a sharp structure variation inside a red-giant star
• Constraining mixing processes in stellar cores using asteroseismology. Impact of semiconvection in low-mass stars
• Asteroseismic determination of helium abundance in stellar envelopes
• Asteroseismic estimate of helium abundance of a solar analog binary system
• The BAyesian STellar Algorithm (BASTA): a fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
• Asteroseismic diagrams for solar-type stars
• Seismic measurement of the locations of the base of convection zone and helium ionization zone for stars in the {\it Kepler} seismic LEGACY sample
• Solar-like oscillations from the depths of the red-giant star KIC 4351319 observed with Kepler
• SpaceInn hare-and-hounds exercise: Estimation of stellar properties using space-based asteroseismic data
• Asteroseismic Diagnostics of Stellar Convective Cores
• On the interpretation of echelle diagrams for solar-like oscillations. Effect of centrifugal distortion
• Blue supergiants as descendants of magnetic main sequence stars
• Seismic detection of acoustic sharp features in the CoRoT target HD49933
• Stellar model fits and inversions
• A Theoretical Study of Acoustic Glitches in Low-Mass Main-Sequence Stars
• Asteroseismic Signatures of Helium gradients in Main-Sequence A Stars ; Application to the roAp Star HD60435
• Asteroseismology of exoplanets hosts stars : tests of internal metallicity
• 85Peg A: which age for a low metallicity solar like star?
• Near-Core Acoustic Glitches are Not Oscillatory: Consequences for Asteroseismic Probes of Convective Boundary Mixing
• Local perturbations of the upper layers of a Sun-like star: the impact on the acoustic oscillation spectrum
• Frequency dependence of the large frequency separation of solar-like oscillators: Influence of the Helium second-ionization zone
• Open issues in probing interiors of solar-like oscillating main sequence stars: 2. Diversity in the HR diagram
• Evolutionary and Observational Properties of Red Giant Acoustic Glitch Signatures
• Asteroseismic Investigations of the Binary System HD176465
• Modeling $\epsilon$ Eridani and asteroseismic tests of element diffusion
• Breaking the core-envelope symmetry in p-mode pulsating stars
• Advanced asteroseismic modelling: breaking the degeneracy between stellar mass and initial helium abundance