Astrophysics and Space Science

, Volume 157, Issue 1–2, pp 15–21

Stellar atmospheric parameters and the IR Caii triplet

  • Elena Terlevich
  • Angeles I. Díaz
  • Roberto Terlevich
A Bundances and Chemical Evolution


The IR Caii triplet at λλ8498, 8542, 8662 Å, relatively easy to observe and measure and free from atmospheric absorption bands, is a powerful tool for the study of the stellar populations in galaxies, provided that we can understand its behaviour with the stellar parameters: effective temperature, surface gravity and metal content. We present here the results of CCD spectroscopic observations for a sample of 86 stars covering a wide range in luminosity, effective temperature and metallicity (from subdwarfs to supergiants and −2.70≤[F3/H]≤0.43), in order to establish the dependence of the IR Caii triplet on stellar atmosphere parameters. We do not confirm previous results giving the main dependence on surface gravity. We find instead a bi-parametric dependence on metallicity and surface gravity, and no dependence on effective temperature.


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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Elena Terlevich
    • 1
    • 2
  • Angeles I. Díaz
    • 3
  • Roberto Terlevich
    • 1
  1. 1.Royal Greenwich ObservatoryHerstmonceux CastleUK
  2. 2.Astronomy CentreUniversity of SussexFalmerUK
  3. 3.Dept. de Física TeóricaUniversidad AutónomaMadridSpain

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