An asteroseismic membership study of the red giants in three open clusters observed by Kepler: NGC6791, NGC6819, and NGC6811

Abstract

Studying star clusters offers significant advances in stellar astrophysics due to the combined power of having many stars with essentially the same distance, age, and initial composition. This makes clusters excellent test benches for verification of stellar evolution theory. To fully exploit this potential, it is vital that the star sample is uncontaminated by stars that are not members of the cluster. Techniques for determining cluster membership therefore play a key role in the investigation of clusters. We present results on three clusters in the Kepler field of view based on a newly established technique that uses asteroseismology to identify fore- or background stars in the field, which demonstrates advantages over classical methods such as kinematic and photometry measurements. Four previously identified seismic non-members in NGC6819 are confirmed in this study, and three additional non-members are found -- two in NGC6819 and one in NGC6791. We further highlight which stars are, or might be, affected by blending, which needs to be taken into account when analysing these Kepler data.

12 pages, 9 figures, 5 tables, accepted by ApJ

References in corpus (11)

• Preparation of Kepler lightcurves for asteroseismic analyses
• Fundamental Properties of Stars using Asteroseismology from Kepler & CoRoT and Interferometry from the CHARA Array
• Asteroseismology of red giants from the first four months of Kepler data: Fundamental parameters
• Asteroseismology of red giants from the first four months of Kepler data: Global oscillation parameters for 800 stars
• The universal red-giant oscillation pattern; an automated determination with CoRoT data
• Sounding open clusters: asteroseismic constraints from Kepler on the properties of NGC 6791 and NGC 6819
• Oscillating K giants with the WIRE satellite: determination of their asteroseismic masses
• Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. I. Measurements, methods, and first results
• High resolution infrared spectroscopy of the old open cluster NGC6791
• Asteroseismic inferences on red giants in open clusters NGC 6791, NGC 6819 and NGC 6811 using Kepler
• Amplitudes of solar-like oscillations: constraints from red giants in open clusters observed by Kepler

Cited by in corpus (75)

• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• Asteroseismology of Solar-Type and Red-Giant Stars
• Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology
• Asteroseismology of old open clusters with Kepler: direct estimate of the integrated RGB mass loss in NGC6791 and NGC6819
• The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
• Rotation and magnetism of Kepler pulsating solar-like stars. Towards asteroseismically calibrated age-rotation relations
• Astrochemistry During the Formation of Stars
• Bayesian distances and extinctions for giants observed by Kepler and APOGEE
• Age dissection of the Milky Way discs: red giants in the Kepler field
• Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. II. age dependencies and new insights
• When Do Stalled Stars Resume Spinning Down? Advancing Gyrochronology with Ruprecht 147
• Asteroseismology of the open clusters NGC 6791, NGC 6811, and NGC 6819 from nineteen months of Kepler photometry
• Measuring the vertical age structure of the Galactic disc using asteroseismology and SAGA
• Stroemgren survey for Asteroseismology and Galactic Archaeology: let the SAGA begin
• Determining stellar parameters of asteroseismic targets: going beyond the use of scaling relations
• Automated preparation of Kepler time series of planet hosts for asteroseismic analysis
• NGC 6819: testing the asteroseismic mass scale, mass loss, and evidence for products of non-standard evolution
• Bayesian peak bagging analysis of 19 low-mass low-luminosity red giants observed with Kepler
• Atmospheric Parameters of 169 F, G, K and M-type Stars in the Kepler Field
• Uncertainties on near-core mixing in red-clump stars: effects on the period spacing and on the luminosity of the AGB bump
• Spin alignment of stars in old open clusters
• WIYN Open Cluster Study. LX. Spectroscopic Binary Orbits in NGC 6819
• The K2 M67 Study: Revisiting old friends with K2 reveals oscillating red giants in the open cluster M67
• Period spacings in red giants IV: Toward a complete description of the mixed-mode pattern
• Searching for Chemical Signatures of Multiple Stellar Populations in the Old, Massive Open Cluster NGC 6791
• Metallicity effect on stellar granulation detected from oscillating red giants in open clusters
• A PSF-based approach to Kepler/K2 data. I. Variability within the K2 Campaign 0 star clusters M 35 and NGC 2158
• Solar-like oscillations in red giants observed with \textit{Kepler}: influence of increased timespan on global oscillation parameters
• Kepler red-clump stars in the field and in open clusters: constraints on core mixing
• Detection and characterisation of oscillating red giants: first results from the TESS satellite
• Testing Asteroseismic Scaling Relations using Eclipsing Binaries in Star Clusters and the Field
• A Lithium-Rich Red Giant Below the Clump in the Kepler Cluster, NGC 6819
• 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
• Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars
• Assessing the accuracy of the gravity determination in late-type stars with solar-like pulsators
• 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
• Spectroscopic Study of the Open Cluster NGC 6811
• The Gaia-ESO Survey: properties of newly discovered Li-rich giants
• Nonlinear seismic scaling relations
• WIYN Open Cluster Study. LIX. Radial-Velocity Membership of the Evolved Population of the Old Open Cluster NGC 6791
• The K2 M67 Study: An Evolved Blue Straggler in M67 from K2 Mission Asteroseismology
• CCD UBVRI photometry of NGC 6811
• The Helium Abundance of NGC 6791 from Modeling of Stellar Oscillations
• A uvbyCaHbeta Analysis of the Old Open Cluster, NGC 6819
• How accurate are stellar ages based on stellar models? II. The impact of asteroseismology
• Study of HD 169392A observed by CoRoT and HARPS
• Asteroseismic Study on Cluster Distance Moduli for RGB Stars in NGC 6791 and NGC 6819
• The Puzzling Li-rich Red Giant Associated with NGC 6819
• CCD UBV photometry of the open cluster NGC 6819
• Convective-core overshoot and suppression of oscillations: Constraints from red giants in NGC6811
• New asteroseismic scaling relations based on Hayashi track relation applied to red-giant branch stars in NGC 6791 and NGC 6819
• Asteroseismology of the Hyades with K2: first detection of main-sequence solar-like oscillations in an open cluster
• Asteroseismology of overmassive, undermassive, and potential past members of the open cluster NGC6791
• 99 oscillating red-giant stars in binary systems with NASA TESS and NASA Kepler identified from the SB9-Catalogue
• Ensemble asteroseismology of pulsating B-type stars in NGC 6910
• Comparison of the Asteroseismic Mass Scale of Red Clump Giants with Photometric Mass Estimates
• Bayesian hierarchical inference of asteroseismic inclination angles
• Asteroseismology of Pulsating Stars
• Extremely precise age and metallicity of the open cluster NGC 2506 using detached eclipsing binaries
• Exploiting the open clusters in the Kepler and CoRoT fields
• UVIT Open Cluster Study. X. Rich Collection of Post Mass Transfer Systems in NGC 6791
• Planets in Open Clusters Detectable by Kepler
• Vetting Asteroseismic $\Delta \nu$ Measurements using Neural Networks
• The Kepler IRIS Catalog: Image subtraction light curves for 9,150 stars in and around the open clusters NGC 6791 and NGC 6819
• Characteristics of solar-like oscillations of secondary red clump stars
• Observational techniques to measure solar and stellar oscillations
• TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting An Extremely Eccentric Exoplanet
• Asteroseismic analysis of eight solar-like oscillating evolved stars in the open cluster NGC 6811
• Asteroseismology of KIC 8263801:Is it a member of NGC 6866 and a red clump star?
• New red giants in NGC 6791 and NGC 6819 using Kepler superstamps
• Stellar oscillations - the adiabatic case
• The odd bunch: chrono-chemo-dynamics of sixteen unusual stars from Kepler
• Kepler Pixel Project -- background RR Lyrae stars in the primary Kepler mission field of view
• Peak Bagging of red giant stars observed by Kepler: first results with a new method based on Bayesian nested sampling