Metallicity in Open Clusters

  • G. Pace
  • L. Pasquini
  • P. François4
  • F. Matteucci
Conference paper
Part of the ESO ASTROPHYSICS SYMPOSIA book series (ESO)

Abstract

We present here the results of abundance measurements of iron, calcium and nickel in four open clusters, from UVES spectra of solar–type stars. A code developed by one of the authors (François) performs line recognization, equivalent width measurements and finally obtains the abundances by means of OSMARCS LTE model atmosphere [4]. Temperature, gravity and microturbulence velocity have to be input to the program. This is made in an automatic way for a grid of values chosen on photometric basis. Those that best reproduce excitation and ionization equilibria are selected and used, namely when no significant trend of the computed abundances is seen, neither versus the excitation potential of the line nor versus its equivalent width, and for which the abundances obtained with lines of different ionization stages of the same specie give equal results within the errors. This check is made with iron lines, we have in fact at least thirty Fe I lines in each star, and six Fe II lines.

Keywords

Open Cluster Equivalent Width Ionization Equilibrium Equal Result Type Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer 2006

Authors and Affiliations

  • G. Pace
    • 1
    • 2
  • L. Pasquini
    • 3
  • P. François4
    • 4
  • F. Matteucci
    • 1
  1. 1.Dipartimento di AstronomiaUniversità di TriesteTriesteItaly
  2. 2.Dipartimento di AstronomiaUniversità di PadovaPadovaItaly
  3. 3.European Southern ObservatoryGarching bei MünchenGermany
  4. 4.Observatoire de ParisParisFrance

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