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The APOGEE value-added catalogue of Galactic globular cluster stars

https://doi.org/10.1093/mnras/stad3020

Schiavon, Ricardo P. ; Phillips, Siân G. ; Myers, Natalie ; Horta, Danny ; Minniti, Dante ; Allende Prieto, Carlos ; Anguiano, Borja ; Beaton, Rachael L. ; Beers, Timothy C. ; Brownstein, Joel R. ; et al ( October 2023 , Monthly Notices of the Royal Astronomical Society)

ABSTRACT
We introduce the Sloan Digital Sky Survey (SDSS)/ Apache Point Observatory Galactic Evolution Experiment (APOGEE) value-added catalogue of Galactic globular cluster (GC) stars. The catalogue is the result of a critical search of the APOGEE Data Release 17 (DR17) catalogue for candidate members of all known Galactic GCs. Candidate members are assigned to various GCs on the basis of position in the sky, proper motion, and radial velocity. The catalogue contains a total of 7737 entries for 6422 unique stars associated with 72 Galactic GCs. Full APOGEE DR17 information is provided, including radial velocities and abundances for up to 20 elements. Membership probabilities estimated on the basis of precision radial velocities are made available. Comparisons with chemical compositions derived from the GALactic Archaeology with HERMES (GALAH) survey, as well as optical values from the literature, show good agreement. This catalogue represents a significant increase in the public data base of GC star chemical compositions and kinematics, providing a massive homogeneous data set that will enable a variety of studies. The catalogue in fits format is available for public download from the SDSS-IV DR17 value-added catalogue website.

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APOGEE detection of N-rich stars in the tidal tails of Palomar 5

https://doi.org/10.1093/mnras/stab3532

Phillips, Siân G. ; Schiavon, Ricardo P. ; Mackereth, J. Ted ; Allende Prieto, Carlos ; Anguiano, Borja ; Beaton, Rachael L. ; Cohen, Roger E. ; García-Hernández, D. A. ; Geisler, Douglas ; Horta, Danny ; et al ( December 2021 , Monthly Notices of the Royal Astronomical Society)

ABSTRACT
Recent results from chemical tagging studies using Apache Point Observatory Galactic Evolution Experiment data suggest a strong link between the chemical abundance patterns of stars found within globular clusters (GC), and chemically peculiar populations in the Galactic halo field. In this paper, we analyse the chemical compositions of stars within the cluster body and tidal streams of Palomar 5, a GC that is being tidally disrupted by interaction with the Galactic gravitational potential. We report the identification of nitrogen-rich (N-rich) stars both within and beyond the tidal radius of Palomar 5, with the latter being clearly aligned with the cluster tidal streams; this acts as confirmation that N-rich stars are lost to the Galactic halo from GCs, and provides support to the hypothesis that field N-rich stars identified by various groups have a GC origin.

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