A Search for Candidate Li-Rich Giant Stars in SDSS DR10

Abstract

We report the results of a search for candidate Li-rich giants among 569,738 stars of the SDSS DR10 dataset. With small variations, our approach is based on that taken in an earlier search for EMP/CEMP stars and uses the same dataset. As part of our investigation, we demonstrate a method for separating post-main sequence and main sequence stars cooler than Teff ~ 5800 K using our feature strength measures of the Sr II 4078, Fe I 4072, and Ca I 4227 lines. By taking carefully selected cuts in a multi-dimensional phase space, we isolate a sample of potential Li-rich giant stars. From these, using detailed comparison with dwarf and giant MILES stars, and our own individual spectral classifications, we identify a set of high likelihood candidate Li-rich giant stars. We offer these for further study to promote an understanding of these enigmatic objects.

arXiv commentAccepted for publication in the Astronomical Journal

References in corpus (18)

• The Seventh Data Release of the Sloan Digital Sky Survey
• MILES: A Medium resolution INT Library of Empirical Spectra
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
• Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters
• Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars
• High-Dispersion Optical Spectra of Nearby Stars Younger Than The Sun
• Lithium Abundances of the Local Thin Disk Stars
• Origin of lithium enrichment in K giants
• Metal-Poor Lithium-Rich Giants in the Radial Velocity Experiment Survey
• Lithium-Rich Giants in Globular Clusters
• Lithium-Rich Field Giants in the Sloan Digital Sky Survey
• The lithium abundances for a large sample of red giants
• An Extremely Lithium-Rich Bright Red Giant in the Globular Cluster M3
• The AMBRE project: a study of Li evolution in the Galactic thin and thick discs
• HD172481: a super lithium-rich metal-deficient post-AGB binary with a red AGB companion
• IRAS12556-7731: a "chamaeleonic" lithium-rich M-giant
• Exploring the SDSS Dataset with Linked Scatter Plots: I. EMP, CEMP, and CV Stars

Cited by in corpus (3)

• Lithium-rich Giants in LAMOST Survey. I. The Catalog
• Li-rich Giants Identified from LAMOST DR8 Low-Resolution Survey
• NutMaat: A Python package for stellar spectral classification on the MK system