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NGC 2419 is the most distant massive globular cluster in the outer Galactichalo. It is unusual also due to the chemical peculiarities found in its redgiant stars in recent years. We study the stellar population of this unusualobject using spectra obtained at the 1.93-m telescope of the Haute-ProvenceObservatory. At variance with commonly used methods of high-resolutionspectroscopy applicable only to bright stars, we employ spectroscopicinformation on the integrated light of the cluster. We carry out populationsynthesis modeling of medium-resolution spectra using synthetic stellaratmosphere models based on a theoretical isochrone corresponding accurately tothe observed color-magnitude diagram. We study the influence of non-LocalThermodynamic Equilibrium for some chemical elements on our results. Thederived age (12.6 Gyr), [Fe/H]=-2.25 dex, helium content Y=0.25, and abundancesof 12 other chemical elements are in a good qualitative agreement withpublished high-resolution spectroscopy estimates for red giant members in thecluster. On the other hand, the derived element abundance, [alpha/Fe]=0.13 dex(the mean of [O/Fe], [Mg/Fe] and [Ca/Fe]), differs from the published one([alpha/Fe] =0.4 dex) for selected red giants in the cluster and may beexplained by a large dispersion in the alpha-element abundances recentlydiscovered in NGC2419. We suggest that studies of the {\it integrated} light inthe cluster using high-resolution spectrographs in different wavelength regionswill help to understand the nature of these chemical anomalies.

Modeling and Analysis of a Spectrum of the Globular Cluster NGC 2419