English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This paper presents [Fe/H] ratios for GCs in the outer halo of the AndromedaGalaxy, M31, based on moderate-resolution, integrated light (IL) spectroscopyof the calcium-II triplet (CaT) lines. The CaT strengths are measured byfitting Voigt profiles to the lines and integrating those profiles;integrations of defined bandpasses are also considered. The [Fe/H] ratios aredetermined using an empirical calibration with CaT line strength, as derivedfrom another sample of M31 GCs that were previously studied at high-resolution.The [Fe/H] ratios for the new GCs reveal that the outer halo GCs are indeedgenerally more metal-poor than typical inner halo GCs, though there are severalmore metal-rich GCs that look to have been accreted from dwarf satellites. Themetallicities of these GCs also place important constraints on the nature ofthe substructure in the outer halo and the dwarf satellites that created thissubstructure.

Metallicities of Outer Halo M31 Globular Clusters from Integrated Light Calcium-II Triplet Spectroscopy