The Peculiar Radial Distribution of Multiple Populations in the massive globular cluster M80

Abstract

We present a detailed analysis of the radial distribution of light-element multiple populations (LE-MPs) in the massive and dense globular cluster M80 based on the combination of UV and optical Hubble Space Telescope data. Surprisingly, we find that first generation stars (FG) are significantly more centrally concentrated than extreme second generation ones (SG) out to $\sim 2.5r_h$ from the cluster center. To understand the origin of such a peculiar behavior, we used a set of $N$-body simulations following the long-term dynamical evolution of LE-MPs. We find that, given the advanced dynamical state of the cluster, the observed difference does not depend on the primordial relative distributions of FG and SG stars. On the contrary, a difference of $\sim 0.05-0.10M_{\odot }$ between the average masses of the two sub-populations is needed to account for the observed radial distributions. We argue that such a mass difference might be the result of the higher He abundance of SG stars (of the order of $\Delta Y\sim 0.05-0.06$) with respect to FG. Interestingly, we find that a similar He variation is necessary to reproduce the horizontal branch morphology of M80. These results demonstrate that differences in mass among LE-MPs, due to different He content, should be properly taken into account for a correct interpretation of their radial distribution, at least in dynamically evolved systems.

arXiv comment19 pages, 9 figures, 1 table; Accepted for publication in ApJ

References in corpus (51)

• On the variation of the Initial Mass Function
• Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters
• Formation and Dynamical Evolution of Multiple Stellar Generations in Globular Clusters
• A large stellar evolution database for population synthesis studies. II. Stellar models and isochrones for an alpha-enhanced metal distribution
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• The ACS Survey of Galactic Globular Clusters. XII. Photometric Binaries along the Main-Sequence
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. IX. The Atlas of Multiple Stellar Populations
• Massive binaries as the source of abundance anomalies in globular clusters
• Super-Massive Stars as a Source of Abundance Anomalies of Proton-Capture Elements in Globular Clusters
• The Charge Transfer Efficiency and Calibration of WFPC2
• Accelerating NBODY6 with Graphics Processing Units
• Origin of the abundance patterns in Galactic globular clusters: constraints on dynamical and chemical properties of globular clusters
• Dynamical age differences among coeval star clusters as revealed by blue stragglers
• Mass segregation and fractal substructure in young massive clusters: (I) the McLuster code and method calibration
• Photometric signatures of multiple stellar populations in Galactic globular clusters
• Dynamical Evolution and Spatial Mixing of Multiple Population Globular Clusters
• The chemical composition of red giant stars in four intermediate-age clusters of the Large Magellanic Cloud
• Blue Straggler Stars: a direct comparison of Star counts and population ratios in six Galactic Globular Clusters
• Blue Straggler Stars: The Spectacular Population in M80
• Mining SDSS in search of Multiple Populations in Globular Clusters
• The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters
• Multimodal Distributions along the Horizontal Branch
• A Dynamical Signature of Multiple Stellar Populations in 47 Tucanae
• The peculiar Horizontal Branch of NGC 2808
• Double Blue Straggler sequences in GCs: the case of NGC 362
• The Hubble Space Telescope UV Legacy Survey of galactic globular clusters. VI. The internal kinematics of the multiple stellar populations in NGC 2808
• Multiple populations in the old and massive Small Magellanic Cloud globular cluster NGC121
• Nitrogen abundances and multiple stellar populations in the globular clusters of the Fornax dSph
• Investigating mass segregation process in globular clusters with Blue Straggler Stars: the impact of dark remnants
• Multiple populations in globular clusters: the distinct kinematic imprints of different formation scenarios
• Blue Straggler Stars in the Unusual Globular Cluster NGC 6388
• First evidence of fully spatially mixed first and second generations in globular clusters: the case of NGC 6362
• Differences in the rotational properties of multiple stellar populations in M 13: a faster rotation for the "extreme" chemical subpopulation
• Star Clusters in M31. V. Evidence for Self-Enrichment in Old M31 Clusters from Integrated Spectroscopy
• Evolution of second generation stars in stellar disks of globular and nuclear clusters: Omega Centauri as a test case
• Radial distributions of sub-populations in the globular cluster M15: a more centrally concentrated primordial population
• The effect of helium-enhanced stellar populations on the ultraviolet-upturn phenomenon of early-type galaxies
• No evidence of mass segregation in the low mass Galactic globular cluster NGC 6101
• The binary fraction in the globular cluster M10 (NGC 6254): comparing core and outer regions
• The "UV-route" to search for Blue Straggler Stars in Globular Clusters: first results from the HST UV Legacy Survey
• Multiwavelength photometry in the Globular Cluster M2
• Observing multiple stellar populations with FORS2@VLT - Main sequence photometry in outer regions of NGC 6752, NGC 6397, and NGC 6121 (M 4)
• Multiple stellar populations in the globular cluster M3 (NGC 5272): a Strömgren perspective
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XIV. Multiple stellar populations within M 15 and their radial distribution
• Evolution of Binary Stars in Multiple-Population Globular Clusters
• Evolution of Binary Stars in Multiple-Population Globular Clusters - II. Compact Binaries
• The Dynamics of Multiple Populations in the Globular Cluster NGC 6362
• Binary Star Disruption in Globular Clusters with Multiple Stellar Populations
• Proper motions and structural parameters of the Galactic globular cluster M71
• Reversed radial distribution trend of subpopulations in the globular clusters NGC 362 and NGC 6723
• M13 multiple stellar populations seen with the eyes of Strömgren photometry

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• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• What is a globular cluster? An observational perspective
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• Formation of Second Generation Stars in Globular Clusters
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• 3D core kinematics of NGC 6362: central rotation in a dynamically evolved globular cluster
• Radial variation of the stellar mass functions in the globular clusters M15 and M30: clues of a non-standard IMF?
• IC4499 revised: spectro-photometric evidence of small light-element variations
• Expanding the time domain of multiple populations: evidences of nitrogen variations in the ~1.5 Gyr old star cluster NGC 1783
• Spectral Energy Distribution of Blue Stragglers in the core of 47 Tucanae
• Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud IV: Evidence for Multiple Populations in Hodge 11 and NGC 2210
• The peculiar kinematics of the multiple populations in the globular cluster Messier 80 (NGC 6093)
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• A 3D view of multiple populations kinematics in Galactic globular clusters
• JWST uncovers helium and water abundance variations in the bulge globular cluster NGC 6440
• Kinematic differences between multiple populations in Galactic globular clusters
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• Ongoing hierarchical massive cluster assembly: the LISCA II structure in the Perseus complex
• The not so simple stellar system Omega Cen. II. Evidence in support of a merging scenario
• Simulations of globular clusters within their parent galaxies: multiple stellar populations and internal kinematics
• Hubble Space Telescope photometry of multiple stellar populations in the inner parts of NGC 2419
• Central kinematics of the Galactic globular cluster M80
• Slowly cooling white dwarfs in NGC 6752
• The structural properties of multiple populations in the dynamically young globular cluster NGC 2419
• Hubble Space Telescope FUV observations of M31's globular clusters suggest a spatially homogeneous helium-enriched sub population
• The Effect of Stellar Helium Abundance on Dynamics of Multiple Populations in Globular Clusters
• Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud V: Multiple Populations in ancient Globular Clusters
• New sub-grouping of multiple stellar populations in NGC 2808 based on low-resolution spectroscopy
• Evolution of the kinematic properties of rotating multiple-population globular clusters
• Is the overconcentration of pristine populations in Galactic globular clusters real? An N-body approach to the problem