A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups

Abstract

Nearby late-type stars are excellent targets for seeking young objects in stellar associations and moving groups. The origin of these structures is still misunderstood, and lists of moving group members often change with time and also from author to author. Most members of these groups have been identified by means of kinematic criteria, leading to an important contamination of previous lists by old field stars. We attempt to identify unambiguous moving group members among a sample of nearby-late type stars by studying their kinematics, lithium abundance, chromospheric activity, and other age-related properties. High-resolution echelle spectra ($R\sim 57000$) of a sample of nearby late-type stars are used to derive accurate radial velocities that are combined with the precise Hipparcos parallaxes and proper motions to compute galactic-spatial velocity components. Stars are classified as possible members of the classical moving groups according to their kinematics. The spectra are also used to study several age-related properties for young late-type stars, i.e., the equivalent width of the lithium Li~{\sc i} \space 6707.8 \space Å\space line or the $R_{\mathrm{HK}}^{\prime }$ index. Additional information like X-ray fluxes from the ROSAT All-Sky Survey or the presence of debris discs is also taken into account. The different age estimators are compared and the moving group membership of the kinematically selected candidates are discussed. From a total list of 405 nearby stars, 102 have been classified as moving group candidates according to their kinematics. i.e., only $\sim$ 25.2 \% of the sample. The number reduces when age estimates are considered, and only 26 moving group candidates (25.5\% of the 102 candidates) have ages in agreement with the star having the same age as an MG member

39 pages, 11 figures. Accepted for publication in Astronomy \& Astrophysics

References in corpus (15)

• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• Debris disks around Sun-like stars
• Nearby debris disk systems with high fractional luminosity reconsidered
• New Debris Disks Around Nearby Main Sequence Stars: Impact on The Direct Detection of Planets
• The nearest young moving groups
• Young Nearby Loose Associations
• A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
• Origin and evolution of moving groups I. Characterization in the observational kinematic-age-metallicity space
• An Activity Catalogue of Southern Stars
• A catalog of chromospherically active binary stars (third edition)
• The Hyades stream: evaporated cluster or intrusion from the inner disk?
• Spitzer 24 Micron Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars
• Magnetic braking in young late-type stars: the effect of polar spots

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• The HADES RV Programme with HARPS-N@TNG. III. Flux-flux and activity-rotation relationships of early-M dwarfs
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