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Chemical and kinematic study of Large Magellanic Cloud RGB stars

Published online by Cambridge University Press:  11 March 2020

Alice Minelli Open the ORCID record for Alice Minelli [Opens in a new window]  and
Alessio Mucciarelli Open the ORCID record for Alessio Mucciarelli [Opens in a new window]
Alice Minelli
Affiliation:
Dipartimento di Fisica e Astronomia - Alma Mater Studiorum Università di Bologna via Piero Gobetti 93/2, 40129 Bologna, Italy INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna via Piero Gobetti 93/3, 40129 Bologna, Italy emails: alice.minelli4@unibo.it, alessio.mucciarelli2@unibo.it
Alessio Mucciarelli
Affiliation:
Dipartimento di Fisica e Astronomia - Alma Mater Studiorum Università di Bologna via Piero Gobetti 93/2, 40129 Bologna, Italy INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna via Piero Gobetti 93/3, 40129 Bologna, Italy emails: alice.minelli4@unibo.it, alessio.mucciarelli2@unibo.it
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Abstract

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The Large Magellanic Cloud (LMC) is the closest massive satellite of the Milky Way (MW), and its proximity allows us to study its stellar populations with great detail, both with resolved photometry and spectroscopy. In turn, this is crucial to unveil its star formation and chemical enrichment histories, and also to investigate the effects that gravitational interactions with other systems (as the Small Magellanic Cloud (SMC) and the MW) may induce on an irregular galaxy. The LMC is characterized by a still on-going star formation activity, as traced by the wide range of ages and metallicities of its stellar populations. However, most of the information about the chemistry and the kinematics of this galaxy has been obtained from low-resolution spectra, which do not allow to draw firm conclusions on many crucial open questions. In particular, (1) we still miss a homogeneous determination of the LMC metallicity distribution; (2) the metal-poor component is still poorly known and described; and (3) we have no conclusive information on the existence of metallicity gradients, which would suggest to spatially inhomegeneous star formation events. To properly address these issues, we analysed nearly 500 high-resolution FLAMES spectra of red giant stars belonging to the LMC field, the largest set of high- resolution spectra of LMC stars analysed so far in a homogeneous way.

Keywords

galaxies: irregular - Local Groupstars: abundancesstars: kinematics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 126 - 130
Copyright
© International Astronomical Union 2020

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