Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999iaus..192..356g&link_type=abstract
The stellar content of Local Group galaxies, Proceedings of the 192nd symposium of the International Astronomical Union held in
Astronomy and Astrophysics
Astronomy
Scientific paper
Lick indices have been widely used for interpretation of stellar content in the Local Group of galaxies. The behavior of the empirical spectral indices with basic atmospheric parameters, which is used as an input for modeling stellar populations, hampers the study of stellar populations in elliptical galaxies due to its limitation parameter space. We have been investigating the potential of theoretical spectral indices based on atmospheric models in order to complement with the empirical indices. In our earlier works we have (Gulati et al., 1993, ApJ, 413, 166; Chavez, et al., 1996, ApJ 471, 726) looked into two generation of the Kurucz's model atmospheres for consistency with empirical indices. New generation of Kurucz's models, which take into account the convection with mixing length theory with and without approximate overshooting, and model colors based on the latter criterion seem to reproduce more observations. In this paper we investigate the role of convection on the Lick indices and present preliminary results.
Chavez Miguel
Gulati Ravi K.
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