Extremely precise age and metallicity of the open cluster NGC 2506 using detached eclipsing binaries

Abstract

Accurate stellar parameters of stars in open clusters can help constrain models of stellar structure and evolution. Here we wish to determine the age and metallicity content of the open cluster NGC 2506. To this end we investigated three detached eclipsing binaries (DEBs; V2032, V4, and V5) for which we determined their masses and radii, as well as four red giant branch stars for which we determined their effective temperatures, surface gravities, and metallicities. Three of the stars in the DEBs have masses close to the cluster turn-off mass, allowing for extremely precise age determination. Comparing the values for the masses and radii of the binaries to BaSTI isochrones we estimated a cluster age of $2.01\pm 0.10$ Gyr. This does depend on the models used in the comparison, where we have found that the inclusion of convective core-overshooting is necessary to properly model the cluster. From red giant branch stars we determined values for the effective temperatures, the surface gravities, and the metallicities. From these we find a cluster metallicity of $-0.36\pm 0.10$ dex. Using this value and the values for the effective temperatures we determine the reddening to be E$(b-y)=0.057\pm 0.004$ mag. Furthermore, we derived the distance to the cluster from Gaia parallaxes and found $3.101\pm 0.017$ kpc, and we have performed a radial velocity membership determination for stars in the field of the cluster. Finally, we report on the detection of oscillation signals in $\gamma$ Dor and $\delta$ Scuti members in data from the TESS mission, including the possible detection of solar-like oscillations in two of the red giants.

arXiv comment30 pages, 16 figures, accepted for publication in MNRAS

References in corpus (64)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• Gaia Data Release 2. Summary of the contents and survey properties
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The Gaia mission
• The Transiting Exoplanet Survey Satellite
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• Fast and scalable Gaussian process modeling with applications to astronomical time series
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• astroquery: An Astronomical Web-Querying Package in Python
• Spectral Irradiance Calibration in the Infrared. XIV: the Absolute Calibration of 2MASS
• Gaia Data Release 2: using Gaia parallaxes
• An absolutely calibrated effective temperature scale from the InfraRed Flux Method
• IAS15: A fast, adaptive, high-order integrator for gravitational dynamics, accurate to machine precision over a billion orbits
• A Gaia DR2 view of the Open Cluster population in the Milky Way
• A library of high resolution synthetic stellar spectra from 300nm to 1.8 micron with solar and alpha-enhanced composition
• Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
• SkyMapper Southern Survey: First Data Release (DR1)
• Photometric Calibration of the First 1.5 Years of the Pan-STARRS1 Survey
• The Updated BaSTI Stellar Evolution Models and Isochrones: I. Solar Scaled Calculations
• The Kepler characterization of the variability among A- and F-type stars. I. General overview
• The White Dwarf Initial-Final Mass Relation for Progenitor Stars From 0.85 to 7.5 M${}_{\odot }$
• Limb and gravity-darkening coefficients for the TESS satellite at several metallicities, surface gravities, and microturbulent velocities
• Clusters and mirages: cataloguing stellar aggregates in the Milky Way
• On the use of Gaia magnitudes and new tables of bolometric corrections
• A non-LTE study of neutral and singly-ionized iron line spectra in 1D models of the Sun and selected late-type stars
• DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
• Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs
• On the metallicity of open clusters. III. Homogenised sample
• Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. II. age dependencies and new insights
• ELLC - a fast, flexible light curve model for detached eclipsing binary stars and transiting exoplanets
• The solar-type eclipsing binary system LL Aquarii
• NGC 6819: testing the asteroseismic mass scale, mass loss, and evidence for products of non-standard evolution
• An asteroseismic membership study of the red giants in three open clusters observed by Kepler: NGC6791, NGC6819, and NGC6811
• The Eclipsing Binary V1061 Cygni: Confronting Stellar Evolution Models for Active and Inactive Solar-Type Stars
• Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. I. Measurements, methods, and first results
• Iron abundances from high-resolution spectroscopy of the open clusters NGC 2506, NGC 6134, and IC 4651
• Discovery of a Third Transiting Planet in the Kepler-47 Circumbinary System
• Comprehensive abundance analysis of red giants in the open clusters NGC 752, NGC 1817, NGC 2360 and NGC 2506
• Synthetic Stellar Photometry - II. Testing the bolometric flux scale, and tables of bolometric corrections for the Hipparcos/Tycho, Pan-STARRS1, SkyMapper and JWST systems
• A new standard: Age and distance for the open cluster NGC 6791 from the eclipsing binary member V20
• Cluster Difference Imaging Photometric Survey. I. Light Curves of Stars in Open Clusters from TESS Sectors 6 & 7
• The K2-HERMES Survey: Age and Metallicity of the Thick Disc
• Stellar Collisions and Blue Straggler Stars in Dense Globular Clusters
• New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field
• Testing Asteroseismic Scaling Relations using Eclipsing Binaries in Star Clusters and the Field
• The Age and Distance of the Kepler Open Cluster NGC 6811 from an Eclipsing Binary, Turnoff Star Pulsation, and Giant Asteroseismology
• Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars
• Chemical composition of evolved stars in the open cluster NGC 2506
• Old open clusters: UBGVRI photometry of NGC 2506
• The [Y/Mg] clock works for evolved solar metallicity stars
• The Blue Straggler Star Population in NGC 1261: Evidence for a Post-Core-Collapse Bounce State
• WIYN Open Cluster Study, LXXVI. Li Evolution Among Stars of Low/Intermediate Mass: The Metal-Deficient Open Cluster, NGC 2506
• The Swift/UVOT Stars Survey. III. Photometry and Color-Magnitude Diagrams of 103 Galactic Open Clusters
• Oscillating Blue Stragglers, gamma Doradus stars and eclipsing binaries in the open cluster NGC2506
• Asteroseismology of the Hyades red giant and planet host epsilon Tauri
• The blue straggler V106 in NGC6791: A prototype progenitor of old single giants masquerading as young
• Systematic Differences in Spectroscopic Analysis of Red Giants
• Convection and Overshoot in models of gamma Doradus and delta Scuti stars
• WIYN Open Cluster Study. LXXII. A uvbyCa Hbeta CCD Analysis of the Metal-Deficient Open Cluster, NGC 2506
• Exploiting the open clusters in the Kepler and CoRoT fields
• On the detectability of solar-like oscillations with the NASA TESS mission
• Exploring Star Clusters Using Stromgren uvby Photometry

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