Empirical Calibration of the Near-IR Ca II Triplet

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CaT: Empirical Calibration of the Near-IR Ca II Triplet

This site is build as a basis to provide Virtual Observatory access to the MILES stellar library.

A dedicated web site can be found here.

The project is dedicated to the empirical calibration of the Ca II triplet and stellar population synthesis modelling. For this purpose, we make use of a new stellar library of 706 stars in the near-IR spectral range (from 8348 Å to 9020 Å with a FWHM of 1.5 Å) which spans a wide range of updated atmospheric parameters. We have defined a new set of near-IR indices which mostly overcome the limitations of previous definitions, being specially suited for the measurement of the Ca II triplet strength corrected for the contamination with Paschen lines. Empirical fitting functions for the above indices have been derived and, together with the full stellar library, have been implemented into an evolutionary stellar populations synthesis model. This allows us to predict both the Ca II triplet strength on the basis of the fitting functions and full near-IR spectra in the range of the library for stellar populations of a wide range of ages and metallicities.



If you use this service in your research, please include the following acknowledgement in any resulting publications:

"Based on data from the CaT library service developed by the Spanish Virtual Observatory in the framework of the IAU Comission G5 Working Group : Spectral Stellar Libraries".

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