The seven sisters DANCe.II. Proper motions and the lithium-rotation-activity connection for G and K Pleiads

Abstract

Stellar clusters are open windows to understand stellar evolution. Specifically, the change with time and the dependence on mass of different stellar properties. As such, they are our laboratories where different theories can be tested. We try to understand the origin of the connection between lithium depletion in F, G and K stars, rotation and activity, in particular in the Pleiades open cluster. We have collected all the relevant data in the literature, including information regarding rotation period, binarity and activity, and cross-matched with proper motions, multi-wavelength photometry and membership probability from the DANCe database. In order to avoid biases, only Pleiades single members with probabilities larger than p=0.75 have been included in the discussion. Results. The analysis confirms that there is a strong link between activity, rotation and the lithium equivalent width excess, specially for the range Lum(bol) = 0.5-0.2 Lsun (about K2-K7 spectral types or 0.75-0.95 Msun). It is not possible to disentangle these effects but we cannot exclude that the observed lithium overabundance is partially an observational effect due to enhanced activity, due to a large coverage by stellar spots induced by high rotation rates. Since a bona fide lithium enhancement is present in young, fast rotators, both activity and rotation should play a role in the lithium problem.

Accepted Astronomy & Astrophysics, three big tables submitted to CDS

References in corpus (12)

• The K2 Mission: Characterization and Early results
• VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• Lithium depletion and the rotational history of exoplanet host stars
• A VLBI Resolution of the Pleiades Distance Controversy
• Near and Mid-IR Photometry of the Pleiades, and a New List of Substellar Candidate Members
• Solar twins in M67
• Rotation, inflation, and lithium in the Pleiades
• The Seven Sisters DANCe. I. Empirical isochrones, Luminosity and Mass Functions of the Pleiades cluster
• The effect of starspots on the radii of low-mass pre-main sequence stars
• The Gaia-ESO Survey: Discovery of a spatially extended low-mass population in the Vela OB2 association
• Radial velocity confirmation of Kepler-91 b. Additional evidence of its planetary nature using the Calar Alto/CAFE instrument

Cited by in corpus (11)

• The Gaia-ESO Survey: Empirical estimates of stellar ages from lithium equivalent widths (EAGLES)
• A Measurement of Radius Inflation in the Pleiades and its Relation to Rotation and Lithium Depletion
• Lithium depletion in solar-like stars: effect of overshooting based on realistic multi-dimensional simulations
• The effects of rotation on the lithium depletion of G- and K-dwarfs in Messier 35
• Lithium depletion boundary, stellar associations, and Gaia
• The evolution of lithium in FGK dwarf stars: The Li rotation connection and the Li desert
• The Gaia-ESO Survey: Constraining evolutionary models and ages for young low mass stars with measurements of lithium depletion and rotation
• The peculiar chemical abundance of the transitional millisecond pulsar PSR J1023+0038 -- Li enhancement
• LAMOST medium-resolution observations of the Pleiades
• The Ages of Optically Bright Sub-Clusters in the Serpens Star-Forming Region
• Suppression of lithium depletion in young low-mass stars from fast rotation