Metallicities of outer halo M31 globular clusters from integrated light calcium-II triplet spectroscopy
Metallicities of outer halo M31 globular clusters from integrated light calcium-II triplet spectroscopy
This paper presents [Fe/H] ratios for GCs in the outer halo of the Andromeda Galaxy, M31, based on moderate-resolution, integrated light (IL) spectroscopy of the calcium-II triplet (CaT) lines. The CaT strengths are measured by fitting Voigt profiles to the lines and integrating those profiles; integrations of defined bandpasses are …