A broad perspective on multiple abundance populations in the globular cluster NGC 1851

Abstract

We present an analysis of the multiple stellar populations of the globular cluster NGC 1851. We used lower resolution spectra of giant stars to measure CN, CH, and calcium H & K spectral indices, and determine elemental abundances for carbon and nitrogen. The CN and CH indices were used to confirm that there are four populations of stars in the cluster. The primordial population of stars, with the lowest CN, was found to be generally chemically distinct in elemental abundances from the second generation populations. As expected, [N/Fe] increases with increasing CN strength, but the only other element that correlated with CN was barium. The two largest populations of stars were found to have the same rate of carbon astration as the stars ascend the giant branch. We were also able to confirm that four previously identified extratidal stars are chemically associated with the cluster. This work shows the benefit of considering the chemistry of globular clusters with both high- and low-resolution spectra.

15 pages, 15 figures, accepted for publication in MNRAS

References in corpus (22)

• Astrophysics Source Code Library
• Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• The ACS Survey of Galactic Globular Clusters. III. The Double Subgiant Branch of NGC 1851
• Rotational mixing in low-mass stars II. Self-consistent models of Pop II RGB stars
• The double Subgiant Branch of NGC 1851: the role of the CNO abundance
• An abundance analysis of bright giants in the globular cluster NGC 1851
• A large C+N+O abundance spread in giant stars of the globular cluster NGC 1851
• CNO abundances in the globular clusters NGC 1851 and NGC 6752
• Carbon in Red Giants in Globular Clusters and Dwarf Spheroidal Galaxies
• Stroemgren photometry of Galactic Globular Clusters. I. New Calibrations of the metallicity index
• First evidence of fully spatially mixed first and second generations in globular clusters: the case of NGC 6362
• The halo+cluster system of the Galactic globular cluster NGC1851
• Radial distributions of sub-populations in the globular cluster M15: a more centrally concentrated primordial population
• Potassium: a new actor on the globular cluster chemical evolution stage. The case of NGC 2808
• Palomar 5 and its Tidal Tails: A Search for New Members in the Tidal Stream
• PyCosmic: a robust method to detect cosmics in CALIFA and other fiber-fed integral-field spectroscopy datasets
• Spectroscopic Signatures of Extra-Tidal Stars Around the Globular Clusters NGC 6656 (M22), NGC 3201 and NGC 1851 from RAVE
• CN Bimodality at Low Metallicity: The Globular Cluster M53
• Low-resolution Spectroscopy for the Globular Clusters with Signs of Supernova Enrichment: M22, NGC 1851 and NGC 288
• Uncovering Multiple Populations with Washington Photometry: I. The Globular Cluster NGC 1851
• An Improved Bandstrength Index for the CH G Band of Globular Cluster Giants

Cited by in corpus (11)

• The Accreted Nuclear Clusters of the Milky Way
• Globular Cluster Formation at High Density: A model for Elemental Enrichment with Fast Recycling of Massive-Star Debris
• Purveyors of fine halos: Re-assessing globular cluster contributions to the Milky Way halo build-up with SDSS-IV
• ESO452-SC11: The lowest mass globular cluster with a potential chemical inhomogeneity
• Light and Heavy Element Abundance Variations in the Outer Halo Globular Cluster NGC 6229
• The CN-CH positive correlation in the globular cluster NGC 5286
• The retrograde orbit of the globular cluster FSR1758 revealed with Gaia DR2
• Identifying Multiple Populations in M71 Using CN
• Multiple Stellar Populations outside the tidal radius of NGC1851 through Gaia DR3 XP Spectra
• Analysis of integrated-light spectra of Galactic globular clusters
• New sub-grouping of multiple stellar populations in NGC 2808 based on low-resolution spectroscopy