Age and distance for the old open cluster NGC188 from the eclipsing binary member V12

Abstract

We present time-series radial-velocity and photometric observations of a solar-type double-lined eclipsing binary star (V12) near the turnoff in the old open cluster NGC188. We use these data to determine the spectroscopic orbit and the photometric elements for V12. From our analysis we determine accurate masses (Mp=1.103+-0.007Msun, Ms=1.081+-0.007Msun) and radii (R =1.424+-0.019Rsun, Rs=1.373+-0.019Rsun) for the primary (p) and secondary (s) binary components. We adopt a reddening of E_(B-V)=0.087 for NGC188, and derive component effective temperatures of 5900+-100K and 5875+-100K, respectively, for the primary and secondary stars. From their absolute dimensions, the two components of V12 yield identical distance moduli of Vo-MV=11.24+-0.09, corresponding to 1770+-75pc. We determine an age of 6.2+-0.2Gyr for V12 and NGC188, from a comparison with theoretical isochrones in the mass-radius diagram. This age is independent of distance, reddening, and color-temperature transformations. We use isochrones from Victoria-Regina (VRSS) and Yonsei-Yale (Y2) with [Fe/H]=-0.1 and [Fe/H]=0.0. From the solar metallicity isochrones, an age of 6.4Gyr provides the best fit to the binary components for both sets of models. For the isochrones with [Fe/H]=-0.1, ages of 6.0Gyr and 5.9Gyr provide the best fits for the VRSS and Y2 models, respectively. We use the distance and age estimates for V12, together with best estimates for the metallicity and reddening of NGC188, to investigate the locations of the corresponding VRSS and Y2 isochrones relative to cluster members in the color-magnitude diagram. Plausible changes in model metallicity and distance to better match the isochrones to the cluster sequences, result in a range of ages for NGC188 that is more than 3 times that resulting from our analysis of V12.

36 pages, 10 figures (1 color), 9 tables

References in corpus (7)

• Accurate fundamental parameters for Lower Main Sequence Stars
• WIYN Open Cluster Study XXXII: Stellar Radial Velocities in the Old Open Cluster NGC 188
• A new standard: Age and distance for the open cluster NGC 6791 from the eclipsing binary member V20
• Absolute dimensions of eclipsing binaries. XXVI. Setting a new standard: Masses, radii, and abundances for the F-type systems AD Bootis, VZ Hydrae, and WZ Ophiuchi
• A Survey of Open Clusters in the u'g'r'i'z' Filter System: III. Results for the Cluster NGC 188
• Absolute properties of the spotted eclipsing binary star CV Bootis
• Eclipsing Binaries in Open Clusters

Cited by in corpus (59)

• Accurate masses and radii of normal stars: modern results and applications
• The Ages of Stars
• The impact of companions on stellar evolution
• When Do Stalled Stars Resume Spinning Down? Advancing Gyrochronology with Ruprecht 147
• The Ages of the Thin Disk, Thick Disk, and the Halo from Nearby White Dwarfs
• Overlapping abundance gradients and azimuthal gradients related to the spiral structure of the Galaxy
• NGC 6819: testing the asteroseismic mass scale, mass loss, and evidence for products of non-standard evolution
• Direct N-Body Modeling of the Old Open Cluster NGC 188: A Detailed Comparison of Theoretical and Observed Binary Star and Blue Straggler Populations
• WIYN Open Cluster Study. XLVIII. The Hard-Binary Population of NGC 188
• Rotation in the Pleiades With K2: III. Speculations on Origins and Evolution
• Implications for the Formation of Blue Straggler Stars from HST Ultraviolet Observations of NGC 188
• WIYN Open Cluster Study. LX. Spectroscopic Binary Orbits in NGC 6819
• The Clusters AgeS Experiment (CASE). IV. Analysis of the Eclipsing Binary V69 in the Globular Cluster 47 Tuc
• Modeling the System Parameters of 2M1533+3759: A New Longer-Period Low-Mass Eclipsing sdB+dM Binary
• Blue Lurkers: Hidden Blue Stragglers on the M67 Main Sequence Identified from their Kepler/K2 Rotation Periods
• On the Origin of Sub-subgiant Stars. I. Demographics
• Bayesian mass and age estimates for transiting exoplanet host stars
• Mapping the Galactic disk with the LAMOST and Gaia Red clump sample: I: precise distances, masses, ages and 3D velocities of $\sim$ 140000 red clump stars
• Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
• The cluster ages experiment (CASE). V. Analysis of three eclipsing binaries in the globular cluster M4
• The age-mass-metallicity-activity relation for solar-type stars: Comparisons with asteroseismology and the NGC 188 open cluster
• WOCS 40007: A Detached Eclipsing Binary near the Turnoff of the Open Cluster NGC 6819
• The homogeneity of the star forming environment of the Milky Way disk over time
• A Long-Period Totally Eclipsing Binary Star at the Turnoff of the Open Cluster NGC 6819 Discovered with Kepler
• The Age and Distance of the Kepler Open Cluster NGC 6811 from an Eclipsing Binary, Turnoff Star Pulsation, and Giant Asteroseismology
• The [Y/Mg] clock works for evolved solar metallicity stars
• Constraining Mass Transfer Histories of Blue Straggler Stars with COS Spectroscopy of White Dwarf Companions
• Testing Models of Stellar Structure and Evolution I. Comparison with Detached Eclipsing Binaries
• WIYN Open Cluster Study. LXXVII. Radial-Velocity Measurements and Spectroscopic Binary Orbits in the Open Cluster NGC 7789
• Eclipsing binaries in the open cluster Ruprecht 147. I: EPIC 219394517
• On the Origin of Sub-subgiant Stars. III. Formation Frequencies
• Timing the Evolution of the Galactic Disk with NGC 6791: An Open Cluster with Peculiar High-$\alpha$ Chemistry as seen by APOGEE
• Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. III. Constraints from a subgiant
• A Chandra X-ray study of the interacting binaries in the old open cluster NGC6791
• WOCS 5379: Detailed Analysis of the Evolution of a Post-Mass-Transfer Blue Straggler
• Grid-based estimates of stellar ages in binary systems. SCEPtER: Stellar CharactEristics Pisa Estimation gRid
• 2MASS photometry and kinematical studies of open cluster NGC 188
• Physical parameter study of eight W Ursae Majoris-type contact binaries in NGC 188
• Systematic Differences in Spectroscopic Analysis of Red Giants
• The X-ray Emissivity of Low-Density Stellar Populations
• Two paths of cluster evolution: global expansion versus core collapse
• WOCS 4540: Detailed Analysis of a Very Long Orbital Period Blue Straggler
• Rubin Observatory LSST Stars Milky Way and Local Volume Star Clusters Roadmap
• A Turnoff Detached Binary Star V568 Lyr in the Kepler Field of the Oldest Open Cluster (NGC 6791) in the Galaxy
• BATC 15 Band Photometry of the Open Cluster NGC 188
• Bayesian Hierarchical Modelling of Initial-Final Mass Relations Across Star Clusters
• Surface brightness-colour relations of dwarf stars from detached eclipsing binaries -- I. Calibrating sample
• Revisiting the mass- and radius-luminosity relations for FGK main-sequence stars
• Distance and age of the massive stellar cluster Westerlund 1. II. The eclipsing binary W36
• Variable stars in the open cluster NGC 2141
• Detection of a Stellar Stream Behind Open Cluster NGC 188: Another Part of the Monoceros Stream
• New stellar age estimates using SPInS based on Gaia DR3 photometry and LAMOST DR8 abundances
• Detection of Open Cluster Members Inside and Beyond Tidal Radius by Machine Learning Methods Based on Gaia DR3
• Absolute Magnitude Calibration for Red Giants based on the Colour-Magnitude Diagrams of Galactic Clusters. I- Calibration with V and (B-V)
• The First Eclipsing Binary Catalogue from the MOA-II database
• Eclipsing Binary Science Via the Merging of Transit and Doppler Exoplanet Survey Data - A Case Study With the MARVELS Pilot Project and SuperWASP
• Kepler Binary Stars in NGC 6819 Open Cluster: KIC 5113146 and KIC 5111815
• Absolute Magnitude Calibration for Red Giants based on the Colour-Magnitude Diagrams of Galactic Clusters. III-Calibration with 2MASS
• Massive Star Clusters in the Semi-Analytical Galaxy Formation Model L-Galaxies 2020