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Stellar atmospheric parameters and the IR Caii triplet

  • A Bundances and Chemical Evolution
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Abstract

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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Authors and Affiliations

  1. Royal Greenwich Observatory, Herstmonceux Castle, UK

    Elena Terlevich & Roberto Terlevich

  2. Astronomy Centre, University of Sussex, Falmer, UK

    Elena Terlevich

  3. Dept. de Física Teórica, Universidad Autónoma, Madrid, Spain

    Angeles I. Díaz

Authors
  1. Elena Terlevich
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  2. Angeles I. Díaz
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  3. Roberto Terlevich
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Terlevich, E., Díaz, A.I. & Terlevich, R. Stellar atmospheric parameters and the IR Caii triplet. Astrophys Space Sci 157, 15–21 (1989). https://doi.org/10.1007/BF00637305

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  • DOI: https://doi.org/10.1007/BF00637305

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