Abundances of four open clusters from solar stars

Abstract

We present the abundance measurements of several elements (Fe, Ca, Na, Ni, Ti, Al, Cr, Si) for 20 solar--type stars belonging to four Galactic open clusters: NGC 3680, IC 4651, Praesepe, and M 67. Oxygen abundances were in addition measured for most of the stars in each cluster apart from IC 4651. For NGC 3680 accurate abundance determinations using high--resolution spectra covering a large spectral domain are computed for the first time. We used UVES high--resolution, high signal to noise ratio spectra and performed a differential analysis with respect to the sun, by measuring equivalent widths and assuming LTE. The most surprising result is a significant supersolar metallicity for Praesepe ([Fe/H]=0.27+-0.10). As for the other clusters, we confirm a supersolar metallicity for IC 4651 ([Fe/H]=0.12+-0.05), a solar metallicity for M 67 ([Fe/H]=0.03+-0.04) and a slight subsolar metallicity for NGC 3680 ([Fe/H]=-0.04+-0.03). We find that the abundance ratios of almost all elements are solar, with the notable exception of oxygen in NGC 3680 and Praesepe, supersolar in the former cluster ([O/Fe]=0.2+-0.05) and as low as [O/Fe]=-0.4+-0.1 in the latter. Observations of several objects per cluster is required to obtain robust results, especially for those elements with a limited number of suitable lines.

16 pages, 2 figures, accepted by A&A

References in corpus (28)

• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The 'Forbidden' Abundance of Oxygen in the Sun
• The Chemical Evolution of the Galaxy: the two-infall model
• Abundance Gradients and the Formation of the Milky Way
• The effective temperature scale of FGK stars. II. Teff : color : [Fe/H] calibrations
• The evolution of the Milky Way from its earliest phases : constraints on stellar nucleosynthesis
• Elemental Abundance Ratios in Stars of the Outer Galactic Disk. I. Open Clusters
• The Distances to Open Clusters from Main-Sequence Fitting. III. Improved Accuracy with Empirically Calibrated Isochrones
• Direct determination of the spiral pattern rotation speed of the Galaxy
• Experimental f-value and isotopic structure for the Ni I line blended with [OI] at 6300A
• The Age-Activity-Rotation Relationship in Solar-Type Stars
• Element abundances of unevolved stars in the open cluster M 67
• The Bologna Open Cluster Chemical Evolution (BOCCE) Project: midterm results from the photometric sample
• Detailed chemical composition of the open cluster IC 4651: The iron peak, alpha elements, and Li
• The chemical abundance of the very metal rich old Open Clusters NGC 6253 and NGC 6791
• Iron abundances from high-resolution spectroscopy of the open clusters NGC 2506, NGC 6134, and IC 4651
• Metal abundances in extremely distant Galactic old open clusters. I. Berkeley 29 and Saurer 1
• WIYN Open Cluster Study 5. Lithium Depletion and Metallicity in G and K Dwarfs of the Open Cluster M35
• High-resolution spectroscopy of the old open cluster Collinder 261:abundances of Iron and other elements
• Element abundances in the metal rich open cluster NGC6253
• Elemental abundances in the Blanco 1 open cluster
• WIYN Open Cluster Study. XXVI. Improved kinematic membership and spectroscopy of IC 2391
• Metallicities for Double Mode RR Lyrae in the Large Magellanic Cloud
• Metal abundances in extremely distant Galactic old open clusters. II. Berkeley 22 and Berkeley 66
• Spectroscopic abundance analysis of dwarfs in young open cluster IC 4665
• uvbyHbeta CCD Photometry of Clusters. IV. Solving the Riddle of NGC 3680
• Deriving temperature, mass and age of evolved stars from high-resolution spectra. Application to field stars and the open cluster IC 4651

Cited by in corpus (69)

• The RAdial Velocity Experiment (RAVE): Fourth data release
• Improved angular momentum evolution model for solar-like stars
• Chemical abundance analysis of the Open Clusters Cr110, NGC2099 (M37), NGC2420, NGC7789 and M67 (NGC2682)
• The evolution of the Galactic metallicity gradient from high-resolution spectroscopy of open clusters
• The Galactic structure and chemical evolution traced by the population of planetary nebulae
• Chemical abundance analysis of the Open Clusters Berkeley 32, NGC 752, Hyades and Praesepe
• The same frequency of planets inside and outside open clusters of stars
• WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-Aged Clusters. 1. Hyades & Praesepe
• Enhanced production of barium in low-mass stars: evidence from open clusters
• On the metallicity of open clusters II. Spectroscopy
• CNONa and 12C/13C in giants of 10 open clusters
• Abundances and possible diffusion of elements in M67 stars
• Solar twins in M67
• New low-mass eclipsing binary systems in Praesepe discovered by K2
• Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
• A 5D view of the Alpha Per, Pleiades, and Praesepe clusters
• Rotation of Late-Type Stars in Praesepe with K2
• M67-1194, an unusually Sun-like solar twin in M67
• s-Processing in the Galactic Disk. I. Super-Solar Abundances of Y, Zr, La, Ce in Young Open Clusters
• The K2 M67 Study: Revisiting old friends with K2 reveals oscillating red giants in the open cluster M67
• A Tale of Two Anomalies: Depletion, Dispersion, and the Connection Between the Stellar Lithium Spread and Inflated Radii on the Pre-Main Sequence
• Radial velocity confirmation of K2-100b: a young, highly irradiated, and low density transiting hot Neptune
• Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey: I The Pleiades
• The evolution of the Milky Way: New insights from open clusters
• Lithium in the Intermediate-Age Open Cluster, NGC 3680
• Chemical composition of the young open clusters IC2602 and IC2391
• Search for giant planets in M67 III: excess of hot Jupiters in dense open clusters
• New atmospheric parameters and spectral interpolator for the MILES cool stars
• The Gaia-ESO Survey: Evidence of atomic diffusion in M67?
• Lithium in M67: From the main sequence to the red giant branch
• The GALAH Survey: Verifying abundance trends in the open cluster M67 using non-LTE spectroscopy
• The Sun was not born in M 67
• O and Na abundance patterns in open clusters of the Galactic disk
• A 4 Gyr M-dwarf Gyrochrone from CFHT/MegaPrime Monitoring of the Open Cluster M67
• The stellar mass function, binary content and radial structure of the open cluster Praesepe derived from PPMXL and SDSS data
• Search for giant planets in M67 IV: survey results
• A Low-Mass Exoplanet Candidate Detected By $K2$ Transiting the Praesepe M Dwarf JS 183
• O, Na, Ba and Eu abundance patterns in open clusters
• Quantifying Chemical Tagging: Towards Robust Group Finding in the Galaxy
• Search for giant planets in M67 I. Overview
• The Chemical Composition of Praesepe (M44)
• Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey: III Praesepe
• Magnetic modeling of inflated low-mass stars using interior fields no larger than ~10 kilogauss
• An investigation of chromospheric activity spanning the Vaughan--Preston gap: impact on stellar ages
• C, N, O abundances and carbon isotope ratios in evolved stars of the open clusters Collinder 261 and NGC 6253
• Stellar population astrophysics (SPA) with the TNG. Revisiting the metallicity of Praesepe (M44)
• Chemical composition of evolved stars in the open cluster IC 4651
• Gravitational redshifts in main-sequence and giant stars
• Discovery of a Transiting Adolescent Sub-Neptune Exoplanet with K2
• Beryllium abundances along the evolutionary sequence of the open cluster IC 4651 - New test for hydrodynamical stellar models
• Abundances and physical parameters for stars in the open clusters NGC 5822 and IC 4756
• The Rotational Evolution of Young, Binary M Dwarfs
• Solar twins in M67 : Evolutionary status and lithium abundance
• Brown dwarfs and very low mass stars in the Praesepe open cluster: a dynamically unevolved mass function?
• Observing the products of stellar evolution in the old open cluster M67 with APOGEE
• Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo
• Super-Earth ingestion can explain the anomalously high metal abundances of M67 Y2235
• The Gaia-ESO Survey: The inner disc, intermediate-age open cluster Pismis 18
• Metallicities of Young Open Clusters I: NGC 7160 and NGC 2232
• The Distances to Open Clusters from Main-Sequence Fitting. V. Extension of Color Calibration and Test using Cool and Metal-Rich Stars in NGC 6791
• The substellar mass function in the central region of the open cluster Praesepe from deep LBT observations
• Sick, the spectroscopic inference crank
• The K2 M67 Study: A Curiously Young Star in an Eclipsing Binary in an Old Open Cluster
• Elemental abundances of intermediate age open cluster NGC 3680
• The Open Cluster Chemical Abundances and Mapping Survey: V. Chemical Abundances of CTIO/Hydra Clusters using The Cannon
• Tracking Cluster Debris (TraCD)- I. Dissolution of clusters and searching the solar cradle
• On the oxygen abundances of M 67 stars from the turn-off point through the red-giant branch
• Detailed Abundances of Planet-Hosting Open Clusters. The Praesepe (Beehive) Cluster
• The discontinuous nature of chromospheric activity evolution