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Title: On the lithium dip in the metal poor open cluster NGC 2243

Lithium is a key element for studying the mixing mechanisms operating in stellar interiors. It can also be used to probe the chemical evolution of the Galaxy and the Big Bang nucleosynthesis. Measuring the abundance of Lithium in stars belonging to Open Clusters (hereafter OC) allows a detailed comparison with stellar evolutionary models. NGC 2243 is particularly interesting thanks to its relative low metallicity ([Fe/H]=−0.54 ± 0.10 dex). We performed a detailed analysis of high-resolution spectra obtained with the multi-object facility FLAMES at the VLT 8.2m telescope. Lithium abundance has been measured in 27 stars. We found a Li dip center of 1.06 M{sub ⊙}, which is significantly smaller than that observed in solar metallicity and metal-rich clusters. This finding confirms and strengthens the conclusion that the mass of the stars in the Li dip strongly depends on stellar metallicity. The mean Li abundance of the cluster is log n(Li) = 2.70 dex, which is substantially higher than that observed in 47 Tue. We derived an iron abundance of [Fe/H]=−0.54±0.10 dex for NGC 2243, in agreement (within the errors) with previous findings.
Authors:
 [1] ; ;  [2] ;  [3] ;  [4]
  1. GEPI, Paris-Meudon Observatory, 61 Avenue de l'Observatoire, F-75014 Paris (France)
  2. ESO, European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München (Germany)
  3. INAF, Capodimonte Astronomical Observatory, via Moiariello 16, 80131 Naples (Italy)
  4. GEPI, Paris-Meudon Observatory, Place Jules Janssen 92190, Meudon (France)
Publication Date:
OSTI Identifier:
22280501
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1594; Journal Issue: 1; Conference: OMEG12: 12. international symposium on origin of matter and evolution of galaxies, Tsukuba (Japan), 18-21 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COSMOLOGY; ELEMENT ABUNDANCE; ENERGY SPECTRA; GALACTIC EVOLUTION; IRON; LITHIUM; MASS; MILKY WAY; NUCLEOSYNTHESIS; STAR CLUSTERS; STARS