Stellar ages and convective cores in field main-sequence stars: first asteroseismic application to two Kepler targets
arXiv:1304.2772 · doi:10.1088/0004-637X/769/2/141
Abstract
Using asteroseismic data and stellar evolution models we make the first detection of a convective core in a Kepler field main-sequence star, putting a stringent constraint on the total size of the mixed zone and showing that extra mixing beyond the formal convective boundary exists. In a slightly less massive target the presence of a convective core cannot be conclusively discarded, and thus its remaining main-sequence life time is uncertain. Our results reveal that best-fit models found solely by matching individual frequencies of oscillations corrected for surface effects do not always properly reproduce frequency combinations. Moreover, slightly different criteria to define what the best-fit model is can lead to solutions with similar global properties but very different interior structures. We argue that the use of frequency ratios is a more reliable way to obtain accurate stellar parameters, and show that our analysis in field main-sequence stars can yield an overall precision of 1.5%, 4%, and 10% in radius, mass and age, respectively. We compare our results with those obtained from global oscillation properties, and discuss the possible sources of uncertainties in asteroseismic stellar modeling where further studies are still needed.
46 pages, 10 figures, ApJ accepted
References in corpus (24)
- New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
- Primordial Nucleosynthesis in the Precision Cosmology Era
- Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
- ADIPLS -- the Aarhus adiabatic oscillation package
- Structure and Evolution of Nearby Stars with Planets II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog
- Correcting stellar oscillation frequencies for near-surface effects
- A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)
- ASTEC -- the Aarhus STellar Evolution Code
- YREC: The Yale Rotating Stellar Evolution Code
- CESAM: a free code for stellar evolution calculations
- Asteroseismology of the solar analogs 16 Cyg A & B from Kepler observations
- Radius determination of solar-type stars using asteroseismology: What to expect from the Kepler mission
- A precise asteroseismic age and radius for the evolved Sun-like star KIC 11026764
- The Liege Oscillation Code
- The Helium abundance and Delta Y / Delta Z in Lower Main Sequence stars
- A Stellar Model-fitting Pipeline for Asteroseismic Data from the Kepler Mission
- Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265
- Asteroseismic Signatures of Small Convective Cores
- Asteroseismology with the Kepler mission
- A Constraint on Z_\odot from Fits of Isochrones to the Color-Magnitude Diagram of M67
- CoRoT/ESTA-TASK 1 and TASK 3 comparison of the internal structure and seismic properties of representative stellar models: Comparisons between the ASTEC, CESAM, CLES, GARSTEC and STAROX codes
- Asteroseismic Diagnostics of Stellar Convective Cores
- Inter-comparison of the g-, f- and p-modes calculated using different oscillation codes for a given stellar model
- Thorough analysis of input physics in CESAM and CLES codes
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- The SAGA so far: reading the history of the Galaxy with asteroseismology