WIYN Open Cluster Study, LXXVI. Li Evolution Among Stars of Low/Intermediate Mass: The Metal-Deficient Open Cluster, NGC 2506

Abstract

HYDRA spectra of 287 stars in the field of NGC 2506 from the turnoff through the giant branch are analyzed. With previous data, 22 are identified as probable binaries; 90 more are classified as potential non-members. Spectroscopic analyses of ~60 red giants and slowly rotating turnoff stars using line equivalent widths and a neural network approach lead to [Fe/H] = -0.27 +/- 0.07 (s.d.) and [Fe/H] = -0.27 +/- 0.06 (s.d.), respectively. Li abundances are derived for 145 probable single-star members, 44 being upper limits. Among turnoff stars outside the Li-dip, A(Li) = 3.04 +/- 0.16 (s.d.), with no trend with color, luminosity, or rotation speed. Evolving from the turnoff across the subgiant branch, there is a well-delineated decline to A(Li) ~1.25 at the giant branch base, coupled with the rotational spindown from between ~20 and 70 km/s to less than 20 km/s for stars entering the subgiant branch and beyond. A(Li) remains effectively constant from the giant branch base to the red giant clump level. A new member above the clump redefines the path of the first-ascent red giant branch; its Li is 0.6 dex below the first-ascent red giants. With one exception, all post-He-flash stars have upper limits to A(Li), at or below the level of the brightest first-ascent red giant. The patterns are in excellent qualitative agreement with the model predictions for low/intermediate-mass stars which undergo rotation-induced mixing at the turnoff and subgiant branch, first dredge-up, and thermohaline mixing beyond the red giant bump.

arXiv comment30 pages, 9 figures, 4 tables. Accepted for Astronomical Journal

References in corpus (54)

• The chemical composition of the Sun
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• The effective temperature scale of FGK stars. II. Teff : color : [Fe/H] calibrations
• The Victoria-Regina Stellar Models: Evolutionary Tracks and Isochrones for a Wide Range in Mass and Metallicity that Allow for Empirically Constrained Amounts of Convective Core Overshooting
• Some Revised Observational Constraints on the Formation and Evolution of the Galactic Disk
• Thermohaline instability and rotation-induced mixing. I - Low- and intermediate-mass solar metallicity stars up to the end of the AGB
• Oxygen Abundances in Nearby FGK Stars and the Galactic Chemical Evolution of the Local Disk and Halo
• Accurate parameters of 93 solar-type Kepler targets
• Lithium abundances in nearby FGK dwarf and subgiant stars: internal destruction, Galactic chemical evolution, and exoplanets
• On the metallicity of open clusters. III. Homogenised sample
• Rotational mixing in low-mass stars : I Effect of the mu-gradients in main sequence and subgiant Pop I stars
• Standard big bang nucleosynthesis and primordial CNO Abundances after Planck
• Origin of lithium enrichment in K giants
• WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-Aged Clusters. 1. Hyades & Praesepe
• Lithium abundances for 185 main-sequence stars - Galactic evolution and stellar depletion of lithium
• Detailed chemical composition of the open cluster IC 4651: The iron peak, alpha elements, and Li
• Iron abundances from high-resolution spectroscopy of the open clusters NGC 2506, NGC 6134, and IC 4651
• Metallicities for 13 nearby open clusters from high-resolution spectroscopy of dwarf and giant stars. Stellar metallicity, stellar mass, and giant planets
• Comprehensive abundance analysis of red giants in the open clusters NGC 752, NGC 1817, NGC 2360 and NGC 2506
• Physical Parameterization of Stellar Spectra: The Neural Network Approach
• Old puzzle, new insights: a lithium rich giant quietly burning helium in its core
• Lithium in the Intermediate-Age Open Cluster, NGC 3680
• Abundances of lithium, oxygen, and sodium in the turn-off stars of Galactic globular cluster 47 Tuc
• Deep Mixing in Evolved Stars. II. Interpreting Li Abundances in RGB and AGB Stars
• Three-Dimensional Spectral Classification of Low-Metallicity Stars Using Artificial Neural Networks
• WIYN/Hydra Detection of Lithium Depletion in F Stars of the Young Open Cluster M35 and Implications for the Development of the Lithium Gap
• A super lithium-rich red-clump star in the open cluster Trumpler 5
• The Gaia -ESO Survey: Lithium enrichment histories of the Galactic thick and thin disc
• The INT Search for Metal-Poor Stars. Spectroscopic Observations and Classification via Artificial Neural Networks
• Lithium Abundances of the Super-Metal-Rich Open Cluster NGC 6253
• Spectroscopic Abundances in the Open Cluster, NGC 6819
• Old open clusters: UBGVRI photometry of NGC 2506
• Chemical composition of evolved stars in the open cluster NGC 2506
• CCD uvbyHbeta Photometry in Clusters: I. The Open Cluster Standard, IC 4651
• Lithium abundance in the metal-poor open cluster NGC 2243
• Beryllium abundances along the evolutionary sequence of the open cluster IC 4651 - New test for hydrodynamical stellar models
• Lithium Abundances in the alpha Per Cluster
• Photometric decomposition of mergers in disk galaxies
• Oscillating Blue Stragglers, gamma Doradus stars and eclipsing binaries in the open cluster NGC2506
• ROBOSPECT: Automated Equivalent Width Measurement
• An Overview of the Rotational Behavior of Metal--Poor Stars
• uvbyCaHbeta CCD Photometry of Clusters. V. The Metal-Deficient Open Cluster NGC 2243
• A uvbyCaHbeta CCD Analysis of the Open Cluster Standard, NGC 752
• On the observational characteristics of lithium-enhanced giant stars in comparison with normal red giants
• On the estimation of stellar parameters with uncertainty prediction from Generative Artificial Neural Networks: application to Gaia RVS simulated spectra
• Rotational and Radial Velocities of 1.3-2.2 M_Sun Red Giants in Open Clusters
• WIYN Open Cluster Study. LXXII. A uvbyCa Hbeta CCD Analysis of the Metal-Deficient Open Cluster, NGC 2506
• Parameterizing Stellar Spectra Using Deep Neural Networks
• Deep and Wide Photometry of Two Open Clusters NGC 1245 and NGC 2506: Dynamical Evolution and Halo
• Multifluid magnetohydrodynamic turbulent decay
• Membership and lithium in the old, metal-poor open cluster Berkeley 32
• Deep and Wide Photometry of Two Open Clusters NGC 1245 and NGC 2506: CCD Observation and Physical Properties
• Lithium Inventory of 2 $M_{\odot }$ Red Clump Stars in Open Clusters: A Test of the Helium Flash Mechanism

Cited by in corpus (22)

• When Do Stalled Stars Resume Spinning Down? Advancing Gyrochronology with Ruprecht 147
• Discovery of ubiquitous lithium production in low-mass stars
• The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
• Light Elements in the Universe
• Li Evolution and the Open Cluster NGC 6819: A Correlation Between Li Depletion and Spindown in Dwarfs More Massive Than the F-Dwarf Li-Dip
• Blue Straggler Populations of Seven Open Clusters with Gaia DR2
• The Swift/UVOT Stars Survey. III. Photometry and Color-Magnitude Diagrams of 103 Galactic Open Clusters
• WIYN Open Cluster Study: The Old Open Cluster, NGC 188, and a Re-evaluation of Lithium-Richness Among Red Giants
• Li in Open Clusters: Cool Dwarfs in the Young, Subsolar Metallicity Cluster M35 (NGC 2168)
• UOCS-VIII. UV Study of the open cluster NGC 2506 using ASTROSAT
• WIYN Open Cluster Study 89. M48 (NGC 2548) 2: Lithium Abundances in the 420 Myr Open Cluster M48 From Giants Through K Dwarfs
• WIYN Open Cluster Study LXXIX. M48 (NGC 2548) I. Radial Velocities, Rotational Velocities, and Metallicities of Stars in the Open Cluster M48 (NGC 2548)
• The Lithium Abundances from the Large Sky Area Multi-object Fiber Spectroscopic Telescope Medium-resolution Survey. I. The Method
• WIYN Open Cluster Study LXXXV. Li in NGC 2243 -- Implications for Stellar and Galactic Evolution
• Extremely precise age and metallicity of the open cluster NGC 2506 using detached eclipsing binaries
• WIYN Open Cluster Study. XC. Radial-velocity Measurements and Spectroscopic Binary Orbits in the Open Cluster NGC 2506
• Lithium in NGC 2243 and NGC 104
• Convective Mixing: The Formation Channel of Li-rich Giants
• WIYN Open Cluster Study LXXXI. Caught in the Act? The Peculiar Red Giant NGC 2243-W2135
• Formation and nature of "Huntsman" binary pulsars
• Detailed Abundances of Planet-Hosting Open Clusters. The Praesepe (Beehive) Cluster
• Do Hertzsprung-Gap Stars Show Any Chemical Anomaly?