Elemental abundances of low-mass stars in the young clusters 25 Ori and lambda Ori

Abstract

Aims. We aim to derive the chemical pattern of the young clusters 25 Orionis and lambda Orionis through homogeneous and accurate measurements of elemental abundances. Methods. We present FLAMES/UVES observations of a sample of 14 K-type targets in the 25 Ori and lambda Ori clusters; we measure their radial velocities, in order to confirm cluster membership. We derive stellar parameters and abundances of Fe, Na, Al, Si, Ca, Ti, and Ni using the code MOOG. Results. All the 25 Ori stars are confirmed cluster members without evidence of binarity; in lambda Ori we identify one non-member and one candidate single-lined binary star. We find an average metallicity [Fe/H]=-0.05+/-0.05 for 25 Ori, where the error is the 1sigma standard deviation from the average. lambda Ori members have a mean iron abundance value of 0.01+/-0.01. The other elements show close-to-solar ratios and no star-to-star dispersion. Conclusions. Our results, along with previous metallicity determinations in the Orion complex, evidence a small but detectable dispersion in the [Fe/H] distribution of the complex. This appears to be compatible with large-scale star formation episodes and initial non-uniformity in the pre-cloud medium. We show that, as expected, the abundance distribution of star forming regions is consistent with the chemical pattern of the Galactic thin disk.

Accepted by Astronomy and Astrophysics. 14 pages, 10 figures, 7 tables

References in corpus (11)

• Radial mixing and the transition between the thick and thin Galactic discs
• A Multi-color Optical Survey of the Orion Nebula Cluster. II. the H-R diagram
• On the Structure of the Orion A Cloud and the Formation of the Orion Nebula Cluster
• Kinematic Structure of the Orion Nebula Cluster and its Surroundings
• FLAMES spectroscopy of low-mass stars in the young clusters sigma Ori and lambda Ori
• Short Lifetime of Protoplanetary Disks in Low-metallicity Environments
• Chemical composition of the Taurus-Auriga association
• Spitzer Observations of the Lambda Orionis cluster. II. Disks around solar-type and low mass stars
• Chemical pattern across the young associations ONC and OB1b
• Sequentially Triggered Star Formation in OB Associations
• Pre-Main Sequence stars in the star forming complex Sh 2-284

Cited by in corpus (25)

• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• Bayesian Ages for Early-Type Stars from Isochrones Including Rotation, and a Possible Old Age for the Hyades
• The GALAH survey: tracing the Galactic disk with Open Clusters
• The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters
• Elemental abundances of low-mass stars in nearby young associations: AB Doradus, Carina Near, and Ursa Major
• Search for Associations Containing Young stars (SACY): Chemical tagging IC 2391 & the Argus association
• The Gaia-ESO Survey: a new approach to chemically characterising young open clusters
• How magnetic activity alters what we learn from stellar spectra
• Mapping the Galactic Metallicity Gradient with Open Clusters: The State-of-the-Art and Future Challenges
• The Chamaeleon II low-mass star-forming region: radial velocities, elemental abundances, and accretion properties
• The Gaia-ESO Survey: metallicity of the Chamaeleon I star forming region
• Empirical classification of VLT/Giraffe stellar spectra in the wavelength range 6440-6810 A in the gamma Vel cluster, and calibration of spectral indices
• The Gaia-ESO Survey: the first abundance determination of the pre-main-sequence cluster Gamma Velorum
• A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- III. Exploring the properties of young associations through their variables, dippers, and candidate exoplanets
• Undetected Binary Stars Cause an Observed Mass Dependent Age Gradient in Upper Scorpius
• Gaia-ESO Survey: Role of magnetic activity and starspots on pre-main sequence lithium evolution
• The low mass star and sub-stellar populations of the 25 Orionis group
• System IMF of the 25 Ori Group from Planetary-Mass Objects to Intermediate/High-Mass Stars
• Characterizing HR3549B using SPHERE
• The GAPS Programme at TNG -- XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
• X-shooter spectroscopy of young stellar objects in Lupus: Lithium, iron, and barium elemental abundances
• The GALAH survey: Chemical homogeneity of the Orion complex
• New Low-Mass Stars in the 25 Orionis Stellar Group and Orion OB1a Sub-association from SDSS-III/BOSS Spectroscopy
• Crossing the Gould Belt in the Orion vicinity
• Oxygen and silicon abundances in Cygnus OB2: Chemical homogeneity in a sample of OB slow rotators