Resumen
Spectra from a sample of bulges hosted by low surface brightness galaxies (LSBGs) are analyzed. The goal is to study stellar population in LSBGs, through the metallicity and the age after an instantaneous burst of stellar formation. Several Lick/IDS indices are calculated using absorption lines, such as H, Mgb and <Fe>=(Fe5270+Fe5335)/2, and also OIII (λ=5007Å) emission line. Models and absorption lines from some standard stars are used to estimate velocity dispersions in the nuclei of this galaxies. Global properties of spectra with different models are compared, adjusting initial mass function (IMF), star formation rate (SFR) and metallicity. A value of [α/Fe]=0.00 is the best fit model. With this value, we find important correlations between Hβ and Mgb, besides Hβ and <Fe>.
