Sarah L. Martell

TL;DR: In this paper, the contribution of high-mass globular clusters to the stellar halo of the Galaxy was investigated using SDSS-II/SEGUE spectra of over 1900 G and K-type halo giants.

TL;DR: The HERMES project as mentioned in this paper uses chemical tagging techniques to reconstruct the star-forming aggregates that built up the disk, the bulge and halo of the Galaxy, which will benefit greatly from the stellar distances and transverse motions from the Gaia mission.

TL;DR: In this paper, the integrals of motion for 31 234 stars, to a distance of 4 kpc from the Sun, were calculated using a combination of data mining, numerical, and statistical techniques.

Abstract: We present an analysis of the CN and CH molecular band strengths in NGC 6791 from low-resolution Sloan Extension for Galactic Understanding and Exploration spectra as a means to detect chemical variations in the cluster. NGC 6791 is a heavily studied open cluster (OC) due to its unique combination of old age, high mass, and high metallicity. These characteristics place NGC 6791 between the physical properties of most globular and OCs. Recent photometric and spectroscopic studies yield contradicting results, with some claiming to detect signs of multiple populations, as in globular clusters, while others do not. We do not find large spreads in the CN and CH band strength distributions that would suggest multiple populations. By pairing spectral synthesis with the measured CN values, we conclude that the maximum [N/Fe] variation in the cluster is 0.2 dex. Additionally, we find that the saturation of the CH band at high metallicities limits its usefulness in detecting multiple populations and determining C abundances.