What is a globular cluster? An observational perspective
@article{Gratton2019WhatIA, title={What is a globular cluster? An observational perspective}, author={Raffaele Gratton and Angela Bragaglia and Eugenio Carretta and Valentina D’Orazi and Sara Lucatello and Antonio Sollima}, journal={The Astronomy and Astrophysics Review}, year={2019}, volume={27}, pages={1-136} }
Globular clusters are large and dense agglomerate of stars. At variance with smaller clusters of stars, they exhibit signs of some chemical evolution. At least for this reason, they are intermediate between open clusters and massive objects such as nuclear clusters or compact galaxies. While some facts are well established, the increasing amount of observational data are revealing a complexity that has so far defied the attempts to interpret the whole data set in a simple scenario. We review…
67 Citations
Multiple Populations in Star Clusters
- PhysicsUniverse
- 2022
We review the multiple population (MP) phenomenon of globular clusters (GCs): i.e., the evidence that GCs typically host groups of stars with different elemental abundances and/or distinct sequences…
Linking globular cluster structural parameters and their evolution: multiple stellar populations
- PhysicsMonthly Notices of the Royal Astronomical Society
- 2021
Globular clusters (GCs) are known to host multiple stellar populations showing chemical anomalies in the content of light elements. The origin of such anomalies observed in Galactic GCs is still…
Properties of Cataclysmic Variables in Globular Clusters
- Physics
- 2020
The study of star clusters plays an important role in our understanding of the Universe since these systems are natural laboratories for testing theories of stellar dynamics and evolution.…
SNe and their impact during the early evolution of Type I Globular Clusters
- Physics
- 2021
The iron composition of globular clusters (GCs) is homogeneous in all but a few massive clusters, despite the presence of multiple stellar populations. Hence, most if not all the supernovae (SN)…
Multiple populations in massive star clusters under the magnifying glass of photometry: theory and tools
- PhysicsThe Astronomy and Astrophysics Review
- 2020
The existence of star-to-star light-element abundance variations in massive Galactic and extragalactic star clusters has fairly recently superseded the traditional paradigm of individual clusters…
Multiple populations in massive star clusters under the magnifying glass of photometry: theory and tools
- Physics
- 2020
The existence of star-to-star light-element abundance variations in massive Galactic and extragalactic star clusters has fairly recently superseded the traditional paradigm of individual clusters…
Star Clusters Near and Far
- PhysicsSpace Science Reviews
- 2020
Star clusters are fundamental units of stellar feedback and unique tracers of their host galactic properties. In this review, we will first focus on their constituents, i.e. detailed insight into…
Star Clusters Near and Far
- Physics
- 2020
Star clusters are fundamental units of stellar feedback and unique tracers of their host galactic properties. In this review, we will first focus on their constituents, i.e. detailed insight into…
Excess of Ca (and Sc) produced in globular cluster multiple populations: a first census in 77 Galactic globular clusters
- Physics
- 2020
Multiple stellar populations in globular clusters (GCs) are distinct by their different abundances of light elements. The abundance anti-correlations point towards a nucleosynthesis origin due to…
Simulations of globular clusters within their parent galaxies: Metallicity spreads and anomalous precursor populations
- PhysicsMonthly Notices of the Royal Astronomical Society
- 2021
Recent observations of globular clusters (GCs) suggest that elemental abundance variations may exist between first-generation (1G) stars. We propose that metal abundance (‘metallicity’) spreads…
References
SHOWING 1-10 OF 613 REFERENCES
Multiple populations in globular clusters
- Physics
- 2012
Recent progress in studies of globular clusters has shown that they are not simple stellar populations, but rather are made up of multiple generations. Evidence stems both from photometry and…
Searching for globular cluster-like abundance patterns in young massive clusters - II. Results from the Antennae galaxies
- Physics
- 2017
The presence of multiple populations (MPs) with distinctive light element abundances is a widespread phenomenon in clusters older than 6 Gyr. Clusters with masses, luminosities, and sizes comparable…
Globular cluster chemistry in fast-rotating dwarf stars belonging to intermediate-age open clusters
- PhysicsAstronomy & Astrophysics
- 2018
The peculiar chemistry observed in multiple populations of Galactic globular clusters is not generally found in other systems such as dwarf galaxies and open clusters, and no model can currently…
Properties of stellar generations in globular clusters and relations with global parameters
- Physics
- 2010
We revise the scenario of the formation of Galactic globular clusters (GCs) by adding the observed detailed chemical composition of their different stellar generations to the set of their global…
Abundance Variations within Globular Clusters
- Physics
- 2004
▪ Abstract Abundance variations within globular clusters (GCs), and of GC stars with respect to field stars, are important diagnostics of a variety of physical phenomena, related to the evolution of…
Enrichment by supernovae in globular clusters with multiple populations
- PhysicsNature
- 2009
It is concluded that these globular clusters, like ω Cen, are most probably the relics of more massive primeval dwarf galaxies that merged and disrupted to form the proto-Galaxy.
Multiple Stellar Populations in Globular Clusters
- PhysicsAnnual Review of Astronomy and Astrophysics
- 2018
Globular clusters (GCs) exhibit star-to-star variations in specific elements (e.g., He, C, N, O, Na, Al) that bear the hallmark of high-temperature H-burning. These abundance variations can be…
The Early Evolution of Globular Clusters: The Case of NGC 2808
- Physics
- 2004
Enhancement and spread of helium among globular cluster stars have been recently suggested as a way to explain the horizontal-branch blue tails in those clusters that show a primordial spread in the…
The peculiar Na-O anticorrelation of the bulge globular cluster NGC 6440
- Physics
- 2017
Context. Galactic globular clusters (GCs) are essential tools for understanding the earliest epoch of the Milky Way, since they are among the oldest objects in the Universe and can be used to trace…
Constraining globular cluster formation through studies of young massive clusters - V. ALMA observations of clusters in the Antennae
- Physics
- 2015
Some formation scenarios that have been put forward to explain multiple populations within Globular Clusters (GCs) require that the young massive cluster have large reservoirs of cold gas within…