Journal article
The chemical compositions of accreted and in situ galactic globular clusters according to SDSS/APOGEE
Monthly notices of the Royal Astronomical Society, Vol.493(3), pp.3363-3378
04/01/2020
DOI: 10.1093/mnras/staa478
Abstract
Studies of the kinematics and chemical compositions of Galactic globular clusters (GCs) enable the reconstruction of the history of star formation, chemical evolution, and mass assembly of the Galaxy. Using the latest data release (DR16) of the SDSS/APOGEE survey, we identify 3090 stars associated with 46 GCs. Using a previously defined kinematic association, we break the sample down into eight separate groups and examine how the kinematics-based classification maps into chemical composition space, considering only α (mostly Si and Mg) elements and Fe. Our results show that (i) the loci of both in situ and accreted subgroups in chemical space match those of their field counterparts; (ii) GCs from different individual accreted subgroups occupy the same locus in chemical space. This could either mean that they share a similar origin or that they are associated with distinct satelliteswhich underwent similar chemical enrichment histories; (iii) the chemical compositions of the GCs associated with the low orbital energy subgroup defined by Massari and collaborators is broadly consistent with an in situ origin. However, at the low-metallicity end, the distinction between accreted and in situ populations is blurred; (iv) regarding the status of GCs whose origin is ambiguous, we conclude the following: the position in Si-Fe plane suggests an in situ origin for Liller 1 and a likely accreted origin for NGC 5904 and NGC 6388. The case of NGC 288 is unclear, as its orbital properties suggest an accretion origin, its chemical composition suggests it may have formed in situ.
Details
- Title: Subtitle
- The chemical compositions of accreted and in situ galactic globular clusters according to SDSS/APOGEE
- Creators
- Danny Horta - Liverpool John Moores UniversityRicardo P. Schiavon - Liverpool John Moores UniversityJ. Ted MacKereth - Liverpool John Moores UniversityTimothy C. Beers - University of Notre DameJosé G. Fernández-Trincado - University of AtacamaPeter M. Frinchaboy - Texas Christian UniversityD. A. García-Hernández - Instituto de Astrofísica de CanariasDoug Geisler - University of La SerenaSten Hasselquist - University of UtahHenrik Jonsson - Lund UniversityRichard R. Lane - Pontificia Universidad Católica de ChileSteven R. Majewski - University of VirginiaSzabolcs Mészáros - Eötvös Loránd UniversityChristian Moni Bidin - Universidad Católica del NorteDavid M. Nataf - Johns Hopkins UniversityAlexandre Roman-Lopes - University of La SerenaChristian Nitschelm - University of AntofagastaJ. Vargas-González - University of HertfordshireGail Zasowski - University of Utah
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.493(3), pp.3363-3378
- DOI
- 10.1093/mnras/staa478
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Language
- English
- Date published
- 04/01/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701732302771
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