The Infrared Ca II Triplet as a Metallicity Indicator of Stellar Populations

Details The Infrared Ca II Triplet as a Metallicity Indicator of Stellar Populations The Infrared Ca II Triplet as a Metallicity Indicator of Stellar Populations

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.1066i&link_type=abstract

Astronomical Journal v.113, p.1066

Astronomy and Astrophysics

Astronomy

27

Scientific paper

The strong triplet lines of Ca II in the near infrared are revisited since some controversy still persists in the literature. We report new spectroscopic data and a new calibration of the CaT index based on an homogeneous set of stellar parameters. Synthetic CaT indices for single population models were computed, using the present new calibration. These models are characterized by ages in the range 1-16 Gyr and metallicities from -2.5 up to +0.3 dex. Our models were checked against a data set of galactic globular clusters, and we showed that the metallicities derived from our calculations are in excellent agreement with the scale by Armandroff & Zirn [AJ, 96, 92 (1988)].

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