Lithium Abundance and Stellar Rotation in Galactic Halo and Thick Disc
Analysis
This paper investigates lithium enrichment and stellar rotation in low-mass giant stars within the Galactic halo and thick disc. It uses large datasets from LAMOST to analyze Li-rich and Li-poor giants, focusing on metallicity and rotation rates. The study identifies a new criterion for characterizing Li-rich giants based on IR excesses and establishes a critical rotation velocity of 40 km/s. The findings contribute to understanding the Cameron-Fowler mechanism and the role of 3He in Li production.
Key Takeaways
- •Investigates Li enrichment and stellar rotation in Galactic halo and thick disc.
- •Uses LAMOST data to analyze Li-rich and Li-poor giant stars.
- •Identifies a new criterion for Li-rich giants based on IR excesses.
- •Establishes a critical rotation velocity of 40 km/s.
- •Contributes to understanding the Cameron-Fowler mechanism and 3He's role in Li production.
Reference
“The study identified three Li thresholds based on IR excesses: about 1.5 dex for RGB stars, about 0.5 dex for HB stars, and about -0.5 dex for AGB stars, establishing a new criterion to characterise Li-rich giants.”