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Transcript
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