Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-10
Mon.Not.Roy.Astron.Soc.326:959,2001
Astronomy and Astrophysics
Astrophysics
24 pages, 10 figures, LaTeX. For associated spectra, tables and software, see http://www.ucm.es/info/Astrof/ellipt/CATRIPLET.h
Scientific paper
10.1046/j.1365-8711.2001.04688.x
A new stellar library at the near-IR spectral region developed for the empirical calibration of the Ca II triplet and stellar population synthesis modeling is presented. The library covers the range 8348-9020 Angstrom at 1.5 Angstrom (FWHM) spectral resolution, and consists of 706 stars spanning a wide range in atmospheric parameters. We have defined a new set of near-IR indices, CaT*, CaT and PaT, which mostly overcome the limitations of previous definitions, the former being specially suited for the measurement of the Ca II triplet strength corrected for the contamination from Paschen lines. We also present a comparative study of the new and the previous calcium indices, as well as the corresponding transformations between the different systems. A thorough analysis of the sources of index errors and the procedure to calculate them is given. Finally, index and error measurements for the whole stellar library are provided together with the final spectra.
Cardiel Nicolas
Cenarro Andrés-Javier
Gorgas Javier
Peletier Reynier F.
Prada Francisco
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