Spectroscopic analysis of the bulge Globular Cluster ESO~456-SC38

Abstract

It has been suggested that the oldest stellar populations in the Milky Way Galaxy are tightly bound and confined to the central regions of the Galaxy. This is one of the reasons why a handful of globular clusters located in the bulge region are thought to be remnants of the primeval formation stages of the Milky Way. The globular cluster, ESO 456-SC38 (Djorgovski~2) is one such cluster; it has a blue horizontal branch, is projected very close to the center of the Galaxy, and has an orbit confining it to the bulge/bar region. The first alpha abundances of seven stars in this heavily reddened cluster are presented using APOGEE DR16. A significant spread in the abundances of N, C, Na, and Al indicates the presence of multiple stellar populations in this cluster. Using Gaia DR2 proper motions and radial velocities from BRAVA-RR, we confirm RR Lyrae stars belong to this globular cluster.

accepted to The Astronomical Journal

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Cited by in corpus (5)

• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• CAPOS: The bulge Cluster APOgee Survey I. Overview and initial ASPCAP results
• APOGEE-2S view of the globular cluster Patchick 125 (Gran 3). New metallicity and elemental abundances from high-resolution spectroscopy
• Spectroscopic Observations of Obscured Populations in the Inner Galaxy: 2MASS-GC02, Terzan 4, and the 200 km/s stellar peak
• CAPOS: The bulge Cluster APOgee Survey VIII. Final ASPCAP results for all clusters