2008/08/18 by Sharina Haynes, Geoffrey Burks, Christian I. Johnson +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Gamma-ray bursts and supernovae #Globular cluster #Horizontal branch #Luminosity #Red giant #Red-giant branch #Spectral line #Spectrograph #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/592717
16 Pages; 3 Figures; 3 Tables; Accepted for publication in PASP
arxiv created 2008/08/18 · openalex publication_date 2008/09/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We have determined Al, α, Fe-peak, and neutron capture elemental abundances for five red-giant branch (RGB) stars in the Galactic globular cluster M10. Abundances were determined using equivalent width analyses of moderate-resolution ( R ∼ 15,000) spectra obtained with the Hydra multifiber positioner and bench spectrograph on the WIYN telescope. The data sample the upper RGB from the luminosity level near the horizontal branch to about 0.5 mag below the RGB tip. We find, in agreement with previous studies, that M10 is moderately metal-poor with [Fe/H] = -1.45 (σ = 0.04). All stars appear enhanced in Al with 〈[Al/Fe]〉 = +0.33 (σ = 0.19), but no stars have [Al/Fe] ≳ +0.55. We find the α elements to be enhanced by +0.20 to +0.40 dex and the Fe-peak elements to have [el/Fe] ∼ 0, which are consistent with predictions from type II SNe ejecta. Additionally, the cluster appears to be r -process rich with 〈[Eu/La]〉 = +0.41.