12 Bootis: a test bed for extra-mixing processes in stars

Abstract

12 Bootis is a spectroscopic binary whose visual orbit has been resolved by interferometry. Though the physical parameters of the system have been determined with an excellent precision, the theoretical modelling of the components is still uncertain. We study the capability of solar-like oscillations to distinguish between calibrated models of the system obtained by including in the stellar modelling different mixing processes. We consider different scenarios for the chemical transport processes: classical overshooting, microscopic diffusion and turbulent mixing. For each of them we calibrate the stellar models of 12 Boo A and B by fitting the available observational constraints by means of a Levenberg-Marquardt minimization algorithm, and finally, we analyze the asteroseismic properties of different calibrated models. Several solutions with 12 Boo A in (or close to) post-main sequence and 12 Boo B on main sequence are found by assuming a thickness of the overshooting layer between 0.06 and 0.23 the pressure scale height. Solutions with both components on the main sequence can be found only by assuming an overshoot larger in the primary than in the secondary, or a more efficient central mixing for 12 Boo A than for 12 Boo B. We show that the detection of solar-like oscillations expected in these stars would allow to distinguish between different scenarios and provide therefore an estimation of the overshooting parameters and of the properties of extra-mixing processes.

12 pages, 11 figures. Accepted for publication in MNRAS

References in corpus (19)

• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• Long-Term Stability of Planets in Binary Systems
• The evolution of rotating stars
• Element Diffusion in the Solar Interior
• The Victoria-Regina Stellar Models: Evolutionary Tracks and Isochrones for a Wide Range in Mass and Metallicity that Allow for Empirically Constrained Amounts of Convective Core Overshooting
• Solar-like oscillations in alpha Centauri B
• Full computation of massive AGB evolution. I. The large impact of convection on nucleosynthesis
• On shear-induced turbulence in rotating stars
• Constraining fundamental stellar parameters using seismology. Application to Alpha Centauri AB
• Oscillation frequencies and mode lifetimes in alpha Centauri A
• The acoustic spectrum of alpha Cen A
• Asteroseismology of the planet-hosting star $\mu$ Arae. I. The acoustic spectrum
• Models for Solar Abundance Stars with Gravitational Settling and Radiative Accelerations: Application to M67 and NGC188
• Observational Tests and Predictive Stellar Evolution II: Non-standard Models
• p-mode frequencies in solar-like stars : I. Procyon A
• New Precision Orbits of Bright Double-Lined Spectroscopic Binaries. I: RR Lyncis, 12 Bootis, and HR 6169
• Testing Stellar Models With An Improved Physical Orbit for 12 Bootis
• 85Peg A: which age for a low metallicity solar like star?
• The Zeta Herculis binary system revisited. Calibration and seismology

Cited by in corpus (17)

• Asteroseismology of Solar-Type and Red-Giant Stars
• CLES, Code Liegeois d'Evolution Stellaire
• Asteroseismology and Interferometry
• The radii and limb darkenings of Alpha Centauri A and B - Interferometric measurements with VLTI/PIONIER
• HD 174884: a strongly eccentric, short-period early-type binary system discovered by CoRoT
• Asteroseismic Signatures of Small Convective Cores
• How accurate are stellar ages based on stellar models? II. The impact of asteroseismology
• In-depth study of 16CygB using inversion techniques
• Characterizing two solar-type Kepler subgiants with asteroseismology: KIC10920273 and KIC11395018
• Stellar ages from asteroseismology
• Constraining convective regions with asteroseismic linear structural inversions
• Inversions of the Ledoux discriminant: a closer look at the tachocline
• Addressing the acoustic tachocline anomaly and the lithium depletion problem at the same time
• Asteroseismology of $\beta$ Cephei stars: The stellar inferences tested in hare and hound exercises
• Gravity modes and mixed modes as probes of stellar cores in main-sequence stars: from solar-like to beta Cep stars
• Constraints on the core mu-gradient of the solar-like star HD 49385 via low-degree mixed modes
• Solar-like oscillations and ellipsoidal variations in TESS observations of the binary 12 Boötis