A new stellar library in the region of the CO index at 2.3 $μ$m. New index definition and empirical fitting functions

Details A new stellar library in the region of the CO index at 2.3 $μ$m. New index definition and empirical fitting functions A new stellar library in the region of the CO index at 2.3 $μ$m. New index definition and empirical fitting functions

2008-06-03

arxiv.org/abs/0806.0581v2

Astronomy and Astrophysics

Astrophysics

26 pages, 15 figures, accepted for publication in A&A. Typos in Eq. 9, 11 and 12 fixed

Scientific paper

10.1051/0004-6361:200810044

Context: The analysis of unresolved stellar populations demands evolutionary synthesis models with realistic physical ingredients and extended wavelength coverage. Aims: To obtain a quantitative description of the first CO bandhead at 2.3 $\mu$m, to allow stellar population models to provide improved predictions in this wavelength range. Methods: We have observed a new stellar library with a better coverage of the stellar atmospheric parameter space than preceding works. We have performed a detailed analysis of the robustness of previous CO index definitions with spectral resolution, wavelength calibration, signal-to-noise ratio, and flux calibration. Results: We define a new line-strength index for the first CO bandhead at 2.3 $\mu$m, D$_{\rm CO}$, better suited for stellar population studies than previous index definitions. We compute empirical fitting functions for the CO feature as a function of the stellar parameters (T$_{\rm eff}$, $\log g$ and [Fe/H]), showing a detailed quantitative metallicity dependence.

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