WIYN Open Cluster Study LXXXI. Caught in the Act? The Peculiar Red Giant NGC 2243-W2135
arXiv:2006.10862 · doi:10.3847/1538-3881/ab9ca2
Abstract
High-dispersion spectra for giants through turnoff stars in the Li 6708 Angstrom region have been obtained and analyzed in the old, metal-deficient open cluster, NGC 2243. When combined with high dispersion data from other surveys, the cluster is found to contain a uniquely peculiar star at the luminosity level of the red clump. The giant is the reddest star at its luminosity, exhibits variability at a minimum 0.1 mag level on a timescale of days, is a single-lined, radial-velocity variable, and has V_sin(i) between 35 and 40 km/sec. In sharp contrast with the majority of the red giant cluster members, the star has a detectable Li abundance, potentially as high or higher than other giants observed to date while at or just below the boundary normally adopted for Li-rich giants. The observed anomalies may be indicators of the underlying process by which the giant has achieved its unusual Li abundance, with a recent mass transfer episode being the most probable within the currently limited constraints.
arXiv comment9 pages, 4 figures. Accepted for the Astronomical Journal
References in corpus (33)
- Gaia Data Release 2. Summary of the contents and survey properties
- The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
- Gaia Data Release 2: Photometric content and validation
- A Gaia DR2 view of the Open Cluster population in the Milky Way
- 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
- The ASAS-SN Catalog of Variable Stars II: Uniform Classification of 412,000 Known Variables
- The Bologna Open Cluster Chemical Evolution (BOCCE) Project: midterm results from the photometric sample
- WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-Aged Clusters. 1. Hyades & Praesepe
- The Gaia-ESO Survey: radial distribution of abundances in the Galactic disc from open clusters and young field stars
- NGC 6819: testing the asteroseismic mass scale, mass loss, and evidence for products of non-standard evolution
- Surface rotation of Kepler red giant stars
- Rapid Rotation of Low-Mass Red Giants Using APOKASC: A Measure of Interaction Rates on the Post-main-sequence
- The Frequency of Rapid Rotation Among K Giant Stars
- Lithium in the Intermediate-Age Open Cluster, NGC 3680
- The Gaia-ESO survey: Calibrating a relationship between Age and the [C/N] abundance ratio with open clusters
- Lithium-rich Giants in LAMOST Survey. I. The Catalog
- WIYN/Hydra Detection of Lithium Depletion in F Stars of the Young Open Cluster M35 and Implications for the Development of the Lithium Gap
- Study of Lithium Rich Giants with the GALAH Spectroscopic Survey
- A Lithium-Rich Red Giant Below the Clump in the Kepler Cluster, NGC 6819
- Lithium Enrichment Signatures of Planetary Engulfment Events in Evolved Stars
- 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
- The Gaia-ESO Survey: properties of newly discovered Li-rich giants
- Lithium Abundances of the Super-Metal-Rich Open Cluster NGC 6253
- Spectroscopic Abundances in the Open Cluster, NGC 6819
- Lithium abundance in the metal-poor open cluster NGC 2243
- WIYN Open Cluster Study. XXXIX. Abundances in NGC 6253 from HYDRA Spectroscopy of the Li 6708 A Region
- A uvbyCaHbeta Analysis of the Old Open Cluster, NGC 6819
- WIYN Open Cluster Study, LXXVI. Li Evolution Among Stars of Low/Intermediate Mass: The Metal-Deficient Open Cluster, NGC 2506
- The Puzzling Li-rich Red Giant Associated with NGC 6819
- Observations of Spin-Down in Post-Mast-Transfer Stars and the Possibility for Blue Straggler Gyrochronology
- uvbyCaHbeta CCD Photometry of Clusters. V. The Metal-Deficient Open Cluster NGC 2243
- WIYN Open Cluster Study. LXXII. A uvbyCa Hbeta CCD Analysis of the Metal-Deficient Open Cluster, NGC 2506