Mass effect on the lithium abundance evolution of open clusters: Hyades, NGC 752, and M67

Abstract

Lithium abundances in open clusters provide an effective way of probing mixing processes in the interior of solar-type stars and convection is not the only mixing mechanism at work. To understand which mixing mechanisms are occurring in low-mass stars, we test non-standard models, which were calibrated using the Sun, with observations of three open clusters of different ages, the Hyades, NGC 752, and M67. We collected all available data, and for the open cluster NGC 752, we redetermine the equivalent widths and the lithium abundances. Two sets of evolutionary models were computed, one grid of only standard models with microscopic diffusion and one grid with rotation-induced mixing, at metallicity [Fe/H] = 0.13, 0.0, and 0.01 dex, respectively, using the Toulouse-Geneva evolution code. We compare observations with models in a color-magnitude diagram for each cluster to infer a cluster age and a stellar mass for each cluster member. Then, for each cluster we analyze the lithium abundance of each star as a function of mass. The data for the open clusters Hyades, NGC 752, and M67, are compatible with lithium abundance being a function of both age and mass for stars in these clusters. Our models with meridional circulation qualitatively reproduce the general trend of lithium abundance evolution as a function of stellar mass in all three clusters. This study points out the importance of mass dependence in the evolution of lithium abundance as a function of age. Comparison between models with and without rotation-induced mixing shows that the inclusion of meridional circulation is essential to account for lithium depletion in low-mass stars. However, our results suggest that other mechanisms should be included to explain the Li-dip and the lithium dispersion in low-mass stars.

arXiv comment13 pages, 9 figures, 2 tables

References in corpus (31)

• The chemical composition of the Sun
• Validation of the new Hipparcos reduction
• Solar Models with Helium and Heavy Element Diffusion
• An absolutely calibrated effective temperature scale from the InfraRed Flux Method
• Influence of gravity waves on the internal rotation and Li abundance of solar-type stars
• Accretion-powered Stellar Winds as a Solution to the Stellar Angular Momentum Problem
• Departures from LTE for neutral Li in late-type stars
• Stellar Winds on the Main-Sequence II: the Evolution of Rotation and Winds
• Hydrodynamical stellar models including rotation, internal gravity waves and atomic diffusion. I. Formalism and tests on Pop I dwarfs
• The Solar Twin Planet Search. I. Fundamental parameters of the stellar sample
• A Hipparcos study of the Hyades open cluster: Improved colour-absolute magnitude and Hertzsprung-Russell diagrams
• The Monitor project: Rotation of low-mass stars in the open cluster NGC 2516
• Element abundances of unevolved stars in the open cluster M 67
• Ground-based CCD astrometry with wide field imagers. II. A star catalogue for M67: [email protected] MPG/ESO astrometry, FLAMES@VLT radial velocities
• Angular Momentum Transport In Solar-Type Stars: Testing the Timescale For Core-Envelope Coupling
• Chemical abundance analysis of the Open Clusters Berkeley 32, NGC 752, Hyades and Praesepe
• Bayesian Ages for Early-Type Stars from Isochrones Including Rotation, and a Possible Old Age for the Hyades
• Solar twins in M67
• Broad-band photometric colors and effective temperature calibrations for late-type giants. I. Z=0.02
• Comprehensive abundance analysis of red giants in the open clusters NGC 752, NGC 1817, NGC 2360 and NGC 2506
• Age and mass of solar twins constrained by lithium abundance
• Lithium evolution in intermediate age and old open clusters: NGC 752 revisited
• Lithium in M67: From the main sequence to the red giant branch
• The solar, exoplanet and cosmological lithium problems
• Lithium, Carbon, and Oxygen Abundances of Hyades F-G Type Stars
• Tracing mixing in stars: new beryllium observations of the open clusters NGC 2516, Hyades, and M67
• Astrometry with the Hubble Space Telescope: Trigonometric Parallaxes of Selected Hyads
• Microscopic diffusion of partly ionized metals in the Sun and metal-poor stars
• Updated Toulouse solar models including the diffusion-circulation coupling and the effect of $\mu$-gradients
• On the Coupling between Helium Settling and Rotation-Induced Mixing in Stellar Radiative Zones: II- Application to light elements in population I main-sequence stars
• On the Coupling between Helium Settling and Rotation-Induced Mixing in Stellar Radiative Zones: I- Analytical Approach

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• Lithium abundance and rotation of seismic solar analogues - Solar and stellar connection from Kepler and Hermes observations
• The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. I. Cluster age range and initial membership selections
• Seismic probing of the first dredge-up event through the eccentric red-giant & red-giant spectroscopic binary KIC9163796
• MESA models with magnetic braking
• The chemical composition of the oldest nearby open cluster Ruprecht 147
• Lithium depletion and angular momentum transport in F-type and G-type stars in Galactic open clusters
• Lithium depletion in solar analogs: age and mass effects
• Lithium and Beryllium in NGC 752 -- An Open Cluster Twice the Age of the Hyades
• A Comparison of the Chemical Composition of Main Sequence and Giant Stars in the Open Cluster NCC 752
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