CAPOS: The bulge Cluster APOgee Survey VIII. Final ASPCAP results for all clusters
arXiv:2508.09970 · doi:10.1051/0004-6361/202554923
Abstract
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. CAPOS, the bulge Cluster APOgee Survey, addresses this key topic by observing a large number of BGCs, most of which have been poorly studied. We aim to obtain accurate mean values for metallicity,[alpha/Fe],and radial velocity, as well as abundances for 11 other elements. We present final parameters based on ASPCAP for all 18 CAPOS BGCs. We carry out a stringent membership selection, finding 303 with SNR>70 and 125 with lower SNR. We reinforced the finding that stars with high [N/Fe] abundances show higher [Fe/H] than their lower [N/Fe] counterparts. Mg,Ca and global alpha abundances show similar trends, while Si is well-behaved. The [Fe/H] value of these 2nd population stars is corrected to derive the mean metallicity. Mean metallicities are determined to a precision of 0.05 dex,[alpha/Fe] to 0.06 dex, and radial velocity to 3.4 km/s. No clusters show strong evidence for internal metallicity variation, including M22. Abundances for 11 other elements using only 1st population stars are calculated and are generally in good agreement with the literature. We develope a new chemodynamical GC classification scheme, synthesizing several recent studies. We also compile up-to-date metallicities. The BGC metallicity distribution is bimodal, with peaks at [Fe/H]=-0.45 and -1.1, with the metal-poor peak strongly dominant, while exsitu GCs are unimodal, with a peak at -1.6. Surprisingly, we find only a small, statistically insignificant difference in the mean [Si/Fe] of in and exsitu GCs. The 4 GCs with the lowest [Si/Fe] values are all exsitu, relatively young, and 3 belong to Sagittarius, but no other correlations are evident.
Main text 24 pages, 9 figures, 6 tables. Appendix, 3 pages, 3 figures. Accepted for publication in A&A
References in corpus (38)
- Gaia EDR3 view on Galactic globular clusters
- APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
- The Chemical Compositions of Accreted and {\it in situ} Galactic Globular Clusters According to SDSS/APOGEE
- A Sequoia in the Garden: FSR 1758 - Dwarf Galaxy or Giant Globular Cluster?
- APOGEE Chemical Abundances of Globular Cluster Giants in the Inner Galaxy
- The K2 Galactic Archaeology Program Data Release 1: Asteroseismic results from Campaign 1
- The Accreted Nuclear Clusters of the Milky Way
- Nitrogen enrichment and clustered star formation at the dawn of the Galaxy
- The age of the Milky Way inner stellar spheroid from RR Lyrae population synthesis
- The Pristine Inner Galaxy Survey (PIGS) II: Uncovering the most metal-poor populations in the inner Milky Way
- BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS)
- A Chemical Composition Survey of the Iron-Complex Globular Cluster NGC 6273 (M 19)
- Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way Bulge
- The distribution of globular clusters in kinematic spaces does not trace the accretion history of the host galaxy
- A spectroscopic study of the Globular Cluster M28 (NGC~6626)
- CAPOS: The bulge Cluster APOgee Survey I. Overview and initial ASPCAP results
- Three candidate globular clusters discovered in the Galactic bulge
- VVV CL001: Likely the Most Metal-Poor Surviving Globular Cluster in the Inner Galaxy
- The complex stellar system M 22: confirming abundance variations with high precision differential measurements
- Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569
- A census of new globular clusters in the Galactic bulge
- CAPOS: the bulge Cluster APOgee Survey II. The Intriguing "Sequoia" Globular Cluster FSR 1758
- Unveiling the nature of 12 new low-luminosity Galactic Globular Cluster Candidates
- Chemical abundances in the metal-intermediate GC NGC 6723
- The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366
- CAPOS: The bulge Cluster APOgee Survey III. Spectroscopic Tomography of Tonantzintla 2
- APOGEE-2S Discovery of Light- and Heavy-Element Abundance Correlations in the Bulge Globular Cluster NGC 6380
- High-resolution CRIRES spectra of Terzan1: a metal-poor globular cluster toward the inner bulge
- Chrono-chemodynamical analysis of the globular cluster NGC 6355: Looking for the fundamental bricks of the Bulge
- Ca Triplet Metallicities and Velocities for twelve Globular Clusters towards the Galactic Bulge
- Cobalt and copper abundances in 56 Galactic bulge red giants
- Intrinsic Metallicity Variation in the Intermediate Mass Type II Globular Cluster NGC 1261
- Is Terzan 5 the remnant of a building block of the Galactic bulge? Evidence from APOGEE
- CAPOS: The bulge Cluster APOgee Survey V. Elemental abundances of the bulge globular cluster HP 1
- Spectroscopic analysis of the bulge Globular Cluster ESO~456-SC38
- Chemo-Dynamical Tagging in the Outskirts: The Origins of Stellar Substructures in the Magellanic Clouds
- CAPOS: The bulge Cluster APOGEE Survey VI. Characterizing multiple stellar populations and chemical abundances in the bulge globular cluster NGC 6569
- CAPOS: The bulge Cluster APOgee Survey VII. First detailed chemical analysis of NGC 6316