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RevMexAA (Serie de Conferencias), 00, 1–1 (2007) ABSTRACT ONLY TESTING STELLAR SPECTRAL LIBRARIES WITH INTEGRATED SPECTRA OF GLOBULAR CLUSTERS Lucimara Martins1 Cı́ria Lima Dias1 and Paula Coelho2 The integrated spectra of stellar systems, like galaxies and star clusters, contain an extraordinary amount of information, and its analysis can reveal fundamental parameters such as metallicity, age and star formation history. A method that is widely used today is the analysis of the integrated spectrum, through the comparison with to models of stellar population. Although this method is a powerful tool for the interpretation of spectra, many ingredients are used in this the models, each one with their assumptions and uncertainties - the library of stellar spectra used, the initial mass function (IMF), the isochrones, etc. It is not always possible to distinguish which uncertainty comes from each ingredient and which one of this ingredients should be improved. In this work we study the quality of the most recent stellar libraries. To do this we use the integrated spectra of globular clusters (Schiavon et al. 2005), that have high quality color magnitude diagrams available in the literature (Rosenberg et al. 2000a e 2000b). With these diagrams it is possible to model the integrated spectra of these objects without the need of adopting evolutionary tracks, thus being able to directly analyze the effects of the stellar library used. We show here that both empirical and theoretical libraries can equaly reproduce the integrated spectra of these systems. 1 Núcleo de Astrofı́sica Teórica, Universidade Cruzeiro do Sul, Rua Galvão Bueno, 868, cep. 01506-000,São Paulo, SP Brazil ([email protected]). 2 Instituto de Astronomia, Geofı́sica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, São Paulo, SP - Brazil. 1