Seismic detection of acoustic sharp features in the CoRoT target HD49933
arXiv:1202.2692 · doi:10.1051/0004-6361/201118495
Abstract
The technique of determining the acoustic location of layers of sharp changes in the sound speed inside a star from the oscillatory signal in its frequencies is applied on a solar-type star, the CoRoT target, HD49933. We are able to determine the acoustic depth of the second helium ionisation zone of HD49933 to be 794 +55/-68 seconds. The acoustic depth of the base of the convective zone is found to be 1855 +173/-412 seconds where the large error bars reflect the ambiguity in the result, which is difficult to determine with present precision on the frequencies because of the intrinsically weak nature of the signal. The positions of both these layers are consistent with those in a representative stellar model of HD49933.
Accepted for publication in Astronomy & Astrophysics
References in corpus (2)
Cited by in corpus (25)
- Asteroseismology of Solar-Type and Red-Giant Stars
- Asymptotic and measured large frequency separations
- PLATO as it is: a legacy mission for Galactic archaeology
- Measurement of acoustic glitches in solar-type stars from oscillation frequencies observed by Kepler
- 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
- Seismic measurement of the locations of the base of convection zone and helium ionization zone for stars in the {\it Kepler} seismic LEGACY sample
- Prospects for asteroseismic inference on the envelope helium abundance in red giant stars
- Helium signature in red giant oscillation patterns observed by Kepler
- SpaceInn hare-and-hounds exercise: Estimation of stellar properties using space-based asteroseismic data
- Study of HD 169392A observed by CoRoT and HARPS
- A Theoretical Study of Acoustic Glitches in Low-Mass Main-Sequence Stars
- Stellar model fits and inversions
- CoRoT and Kepler results: Solar-like oscillators
- Grid-based seismic modelling at high and low signal-to-noise ratios HD 181420 and HD 175272
- On using dipolar modes to constrain the helium glitch in red-giant stars
- Seismic constraints on the internal structure of evolved stars: From high-luminosity RGB to AGB stars
- Asteroseismology of main-sequence F stars with \textit{Kepler}: overcoming short mode lifetimes
- Multi-cavity gravito-acoustic modes in stars: A general analytical resonance condition
- Near-Core Acoustic Glitches are Not Oscillatory: Consequences for Asteroseismic Probes of Convective Boundary Mixing
- The CoRoT target HD49933: a possible seismic signature of heavy elements ionization in the deep convective zone
- Diagnostics from solar and stellar glitches
- Asteroseismic Investigations of the Binary System HD176465
- Physical interpretation of the oscillation spectrum on the RGB and AGB
- On the possibility of using seismic probes to study the core composition in pulsating white dwarfs