CAPOS: The bulge Cluster APOgee Survey I. Overview and initial ASPCAP results
Creators: name: Geisler, Doug
name: Villanova, Sandro
name: O'Connell, Julia E.
name: Cohen, Roger E.
name: Bidin, Christian Moni
name: Fernández-Trincado, José G.
name: Muñoz, Cesar
name: Minniti, Dante
name: Zoccali, Manuela
name: Rojas-Arriagada, Alvaro
name: Ramos, Rodrigo Contreras
name: Catelan, Márcio
name: Mauro, Francesco
name: Cortés, Cristían
name: Lopes, C. E. Ferreira
name: Arentsen, Anke
name: Starkenburg, Else
name: Martin, Nicolas F.
name: Tang, Baitian
name: Parisi, Celeste
name: Alonso-García, Javier
name: Gran, Felipe
name: Cunha, Katia
name: Smith, Verne
name: Majewski, Steven R.
name: Jönsson, Henrik
name: García-Hernández, D. A.
name: Horta, Danny
name: Mészáros, Szabolcs
name: Monaco, Lorenzo
name: Monachesi, Antonela
name: Muñoz, Ricardo R.
name: Brownstein, Joel
name: Beers, Timothy C.
name: Lane, Richard R.
name: Barbuy, Beatriz
name: Sobeck, Jennifer
name: Henao, Lady
name: González-Díaz, Danilo
name: Miranda, Raúl E.
name: Reinarz, Yared
name: Santander, Tatiana A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Context. Bulge globular clusters (BGCs) are exceptional tracers of the formation and chemodynamical evolution of this oldest Galactic component. However, until now, observational difficulties have prevented us from taking full advantage of these powerful Galactic archeological tools. Aims. CAPOS, the bulge Cluster APOgee Survey, addresses this key topic by observing a large number of BGCs, most of which have only been poorly studied previously. Even their most basic parameters, such as metallicity, [α/Fe], and radial velocity, are generally very uncertain. We aim to obtain accurate mean values for these parameters, as well as abundances for a number of other elements, and explore multiple populations. In this first paper, we describe the CAPOS project and present initial results for seven BGCs. Methods. CAPOS uses the APOGEE-2S spectrograph observing in the H band to penetrate obscuring dust toward the bulge. For this initial paper, we use abundances derived from ASPCAP, the APOGEE pipeline. Results. We derive mean [Fe/H] values of $-$0.85$\pm$0.04 (Terzan 2), $-$1.40$\pm$0.05 (Terzan 4), $-$1.20$\pm$0.10 (HP 1), $-$1.40$\pm$0.07 (Terzan 9), $-$1.07$\pm$0.09 (Djorg 2), $-$1.06$\pm$0.06 (NGC 6540), and $-$1.11$\pm$0.04 (NGC 6642) from three to ten stars per cluster. We determine mean abundances for eleven other elements plus the mean [$α$/Fe] and radial velocity. CAPOS clusters significantly increase the sample of well-studied Main Bulge globular clusters (GCs) and also extend them to lower metallicity. We reinforce the finding that Main Bulge and Main Disk GCs, formed in situ, have [Si/Fe] abundances slightly higher than their accreted counterparts at the same metallicity. We investigate multiple populations and find our clusters generally follow the light-element (anti)correlation trends of previous studies of GCs of similar metallicity. We finally explore the abundances ...
description: 27 pages, 10 figures, 5 tables. Abridged abstract. Accepted for publication in Astronomy &amp; Astrophysics (A&amp;A)