Metallicity of low-mass stars in Orion

Abstract

Determining the metal content of low-mass members of young associations provides a tool that addresses different issues, such as triggered star formation or the link between the metal-rich nature of planet-host stars and the early phases of planet formation. The Orion complex is a well known example of possible triggered star formation and is known to host a rich variety of proto-planetary disks around its low-mass stars. Available metallicity measurements yield discrepant results. We analyzed FLAMES/UVES and Giraffe spectra of low-mass members of three groups/clusters belonging to the Orion association. Our goal is the homogeneous determination of the metallicity of the sample stars, which allows us to look for [Fe/H] differences between the three regions and for the possible presence of metal-rich stars. Nine members of the ONC and one star each in the $\lambda$ Ori cluster and OB1b subgroup were analyzed. After the veiling determination, we retrieved the metallicity by means of equivalent widths and/or spectral synthesis using MOOG. We obtain an average metallicity for the ONC [Fe/H]=-0.01\pm 0.04. No metal-rich stars were detected and the dispersion within our sample is consistent with measurement uncertainties. The metallicity of the $\lambda$ Ori member is also solar, while the OB1b star has an [Fe/H] significantly below the ONC average. If confirmed by additional [Fe/H] determinations in the OB1b subgroup, this result would support the triggered star formation and the self-enrichment scenario for the Orion complex.

13 pages, accepted for publication in A&A

References in corpus (5)

• Evolved stars hint to an external origin of enhanced metallicity in planet-hosting stars
• The Hyades stream: evaporated cluster or intrusion from the inner disk?
• FLAMES spectroscopy of low-mass stars in the young clusters sigma Ori and lambda Ori
• The brightest stars of the sigma Orionis cluster
• Chemical composition of the young open clusters IC2602 and IC2391

Cited by in corpus (40)

• Protoplanetary Disks and Their Evolution
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• A Multi-color Optical Survey of the Orion Nebula Cluster. II. the H-R diagram
• The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits. IV. Gravitational instability rarely forms wide, giant planets
• The GALAH survey: tracing the Galactic disk with Open Clusters
• The Solar Twin Planet Search III. The [Y/Mg] clock: estimating stellar ages of solar-type stars
• IN-SYNC IV - The Young Stellar Population in the Orion A Molecular Cloud
• The VLT/NaCo Large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits: I- Sample definition and characterization
• The chemical composition of the Orion star-forming region. III. C, N, Ne, Mg and Fe abundances in B-type stars revisited
• 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
• Chemical composition of the Taurus-Auriga association
• How magnetic activity alters what we learn from stellar spectra
• Testing pre-main sequence models: the power of a Bayesian approach
• Lithium-7 surface abundance in pre-MS stars. Testing theory against clusters and binary systems
• The debris disk host star HD 61005: a member of the Argus Association?
• Mixing of Clumpy Supernova Ejecta into Molecular Clouds
• APOGEE Net: Improving the derived spectral parameters for young stars through deep learning
• Chemical pattern across the young associations ONC and OB1b
• 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
• Elemental abundances of low-mass stars in the young clusters 25 Ori and lambda Ori
• 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
• Discovery of a 21 Myr old stellar population in the Orion complex
• The 3-D Kinematics of the Orion Nebula Cluster: NIRSPEC-AO Radial Velocities of the Core Population
• Dust clearing by radial drift in evolving protoplanetary discs
• The GAPS Programme at TNG -- XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
• HST survey of the Orion Nebula Cluster in the H${}_2$O 1.4 $\mu$m absorption band: II. The substellar IMF down to planetary masses
• Evidence for Cluster to Cluster Variations in Low-Mass Stellar Rotational Evolution
• Benchmark cool companions: Ages and abundances for the PZ Tel system
• Empirical Near Infrared colors for low-mass stars and brown dwarfs in the Orion Nebula Cluster
• The influence of metallicity on a combined stellar and disk evolution
• XMM-Newton observations of the young open cluster around lambda Orionis
• The 3D Kinematics of the Orion Nebula Cluster II: Mass-dependent Kinematics of the Inner Cluster
• Effects of physical conditions on the stellar initial mass function: The low-metallicity star-forming region Sh 2-209
• Study of Eclipsing Binary and Multiple Systems in OB Associations: I. Ori OB1a - IM Mon
• New Observations and Analysis of the Bright Semi-Detached Eclipsing Binary mu1 Sco
• Multi-Object and Long-Slit Spectroscopy of Very Low Mass Brown Dwarfs in Orion Nebular Cluster
• Accretion in low-mass members of the Orion Nebula Cluster with young transition disks