Asteroseismology of overmassive, undermassive, and potential past members of the open cluster NGC6791

Abstract

We perform an asteroseismic investigation of giant stars in the field of NGC 6791 with previous indications of atypical evolution. The analysis makes use of observations from Kepler and Gaia in combination with ground-based photometry, a literature radial-velocity study, and measurements of eclipsing binaries in the cluster. We derive mass, radius, effective temperature, evolutionary stage and apparent distance modulus of each target. Among the investigated cluster giants we find clear evidence of overmassive and undermassive members, and non-members with strong hints of potential past membership. Our results indicate that about 10% of the red giants in the cluster have experienced mass-transfer or a merger. High resolution, high-S/N spectroscopic follow-up could confirm potential past membership of the non-members, and reveal whether certain element abundances might expose the non-standard evolution of overmassive and undermassive stars. If so, field stars of similar type could be identified as what they are, i.e. over- or undermassive stars, and not mistakenly classified as younger or older than they are.

14 pages, 5 figures, accepted for publication in MNRAS

References in corpus (20)

• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• Gaia Early Data Release 3: Photometric content and validation
• Gaia EDR3 view on Galactic globular clusters
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Synthetic Stellar Photometry - I. General considerations and new transformations for broad-band systems
• Parallax Systematics and Photocenter Motions of Benchmark Eclipsing Binaries in Gaia EDR3
• Young [$\alpha$/Fe]-enhanced stars discovered by CoRoT and APOGEE: What is their origin?
• Age dissection of the Milky Way discs: red giants in the Kepler field
• 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
• Binary stars in the Galactic thick disc
• WIYN Open Cluster Study. LX. Spectroscopic Binary Orbits in NGC 6819
• The Parallax Zero-Point of Gaia Early Data Release 3 from LAMOST Primary Red Clump Stars
• Gaia EDR3 Parallax Zero-point Offset based on W Ursae Majoris-type Eclipsing Binaries
• Metallicities and Radial Velocities of Five Open Clusters Including a New Candidate Member of the Monoceros Stream
• A Comprehensive Power Spectral Density Analysis of Astronomical Time Series. II. The Swift/BAT Long Gamma-Ray Bursts
• WIYN Open Cluster Study. LIX. Radial-Velocity Membership of the Evolved Population of the Old Open Cluster NGC 6791
• Asteroseismology of the Hyades red giant and planet host epsilon Tauri
• Systematic Differences in Spectroscopic Analysis of Red Giants

Cited by in corpus (14)

• Discovery of post-mass-transfer helium-burning red giants using asteroseismology
• A prescription for the asteroseismic surface correction
• Integrated Mass Loss of Evolved Stars in M4 using Asteroseismology
• Asteroseismic Fingerprints of Stellar Mergers
• Revised extinctions and radii for 1.5 million stars observed by APOGEE, GALAH, and RAVE
• An asteroseismic age estimate of the open cluster NGC 6866 using Kepler and Gaia
• One Star to Tag Them All (OSTTA): I. Radial velocities and chemical abundances for 20 poorly studied open clusters
• Red Horizontal Branch stars: an asteroseismic perspective
• Establishing the accuracy of asteroseismic mass and radius estimates of giant stars III. KIC4054905, an eclipsing binary with two 10 Gyr thick disk RGB stars
• Establishing the accuracy of asteroseismic mass and radius estimates of giant stars. II. Revised stellar masses and radii for KIC 8430105
• Anomalously low-mass core-He-burning star in NGC 6819 as a post-common-envelope phase product
• DUETS: Setting expectations for asteroseismic binaries and binary products with synthetic populations
• Not all nitrogen-rich field stars originate from globular clusters
• Attempting an accurate age estimate of the open cluster NGC 6633 using CoRoT and Gaia