An extensive library of synthetic spectra covering the far red, RAVE and GAIA wavelength ranges

Abstract

A library of 183588 synthetic spectra based on Kurucz's ATLAS9 models is presented for the far red spectral interval (7653-8747 Å). It is characterized by 3500 K ≤ Teff ≤ 47500 K, 0.0 ≤ log g ≤ 5.0, -3.0 ≤ [M/H] ≤ +0.5, 0 ≤ Vrot ≤ 500 km s -1, ξ = 2 km s-1. The whole grid of spectra is calculated for resolving powers 8500, 11500 and 20000. A section of the grid is also computed for [α/Fe] = +0.4 and for microturbulent velocities 0 and 4 km s-1. The library covers the wavelength ranges and resolutions of the two ambitious spectroscopic surveys by the ground experiment RAVE and the space mission GAIA. Cross-sections across the multi-dimensional data-cube are used to illustrate the behaviour of the strongest spectral lines. Interpretation of real data will have to include interpolation to grid substeps. We present a simple estimate of the accuracy of such a procedure.