Differences in the rotational properties of multiple stellar populations in M 13: a faster rotation for the "extreme" chemical subpopulation

Abstract

We use radial velocities from spectra of giants obtained with the WIYN telescope, coupled with existing chemical abundance measurements of Na and O for the same stars, to probe the presence of kinematic differences among the multiple populations of the globular cluster (GC) M13. To characterise the kinematics of various chemical subsamples, we introduce a method using Bayesian inference along with an MCMC algorithm to fit a six-parameter kinematic model (including rotation) to these subsamples. We find that the so-called "extreme" population (Na-enhanced and extremely O-depleted) exhibits faster rotation around the centre of the cluster than the other cluster stars, in particular when compared to the dominant "intermediate" population (moderately Na-enhanced and O-depleted). The most likely difference between the rotational amplitude of this extreme population and that of the intermediate population is found to be $\sim$4 km s${}^{-1}$, with a 98.4% probability that the rotational amplitude of the extreme population is larger than that of the intermediate population. We argue that the observed difference in rotational amplitudes, obtained when splitting subsamples according to their chemistry, is not a product of the long-term dynamical evolution of the cluster, but more likely a surviving feature imprinted early in the formation history of this GC and its multiple populations. We also find an agreement (within uncertainties) in the inferred position angle of the rotation axis of the different subpopulations considered. We discuss the constraints that these results may place on various formation scenarios.

Accepted for publication in MNRAS

References in corpus (27)

• galpy: A Python Library for Galactic Dynamics
• Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
• Formation and Dynamical Evolution of Multiple Stellar Generations in Globular Clusters
• The SAURON project -- X. The orbital anisotropy of elliptical and lenticular galaxies: revisiting the (V/sigma,epsilon) diagram with integral-field stellar kinematics
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. IX. The Atlas of Multiple Stellar Populations
• A General Abundance Problem for All Self-Enrichment Scenarios for the Origin of Multiple Populations in Globular Clusters
• Halo globular clusters observed with AAOmega: dark matter content, metallicity and tidal heating
• Chemical composition and constraints on mass loss for globular clusters in dwarf galaxies: WLM and IKN
• Isochrones for Old (> 5 Gyr) Stars and Stellar Populations. I. Models for $-2.4\le$ [Fe/H] $\le +0.6$, $0.25\le Y\le 0.33$, and $-0.4\le$ [$\alpha$\Fe] $\le +0.4$
• Central rotations of Milky Way Globular Clusters
• N-body Models of Rotating Globular Clusters
• Multiple populations in globular clusters: the distinct kinematic imprints of different formation scenarios
• Helium and Multiple Populations in the Massive Globular Cluster NGC6266 (M62)
• First evidence of fully spatially mixed first and second generations in globular clusters: the case of NGC 6362
• The Gaia-ESO Survey: Kinematics of seven Galactic globular clusters
• The primordial and evolutionary abundance variations in globular-cluster stars: a problem with two unknowns
• Comparative study between N-body and Fokker-Planck simulations for rotating star clusters - II. 2-component models
• Kinematical fingerprints of star cluster early dynamical evolution
• Radial distributions of sub-populations in the globular cluster M15: a more centrally concentrated primordial population
• 2D Fokker-Planck models of rotating clusters
• A study of rotating globular clusters - the case of the old, metal-poor globular cluster NGC 4372
• Evolution of Binary Stars in Multiple-Population Globular Clusters
• The Flattening of Globular Clusters
• Face-on accretion onto a protoplanetary disc
• Light-Element Abundances of Giant Stars in the Globular Cluster M71 (NGC 6838)
• Galactic globular cluster 47 Tucanae: new ties between the chemical and dynamical evolution of globular clusters?

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• The role of rotation on the formation of second generation stars in globular clusters
• The dynamical origin of multiple populations in intermediate-age clusters in the Magellanic Clouds
• Monte Carlo simulations of multiple populations in globular clusters: constraints on the cooling flow vs. accretion scenario using million bodies simulations
• MOCCA: Dynamics and evolution of binary stars of multiple stellar populations in tidally filling and underfilling globular star clusters
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• A 3D view of multiple populations kinematics in Galactic globular clusters
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• The Rotation of Selected Globular Clusters and the Differential Rotation of M3 in Multiple Populations from the SDSS-IV APOGEE-2 Survey
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• MOCCA: Global properties of tidally filling and underfilling globular star clusters with multiple stellar populations
• A simple two-component description of energy equipartition and mass segregation for anisotropic globular clusters
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• Evolution of the disky second generation of stars in globular clusters on cosmological timescale
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• The Origin of Young Stellar Populations in NGC 1783: Accretion of External Stars
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