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Sánchez Blázquez, Patricia ; Gorgas García, Francisco Javier ; Cardiel López, Nicolás ; Cenarro, J. ; González, J. J. | IOP Publishing | 2003-06-20Central line-strength indices were measured in the blue spectral region for a sample of 98 early-type galaxies in different environments. For most indices (Mg b and [Fe] in particular), elliptical galaxies in rich clusters and in low-density reg[...]texto impreso
Cardiel López, Nicolás ; Gorgas García, Francisco Javier ; Cenarro, J. ; González, J. J. | EDP Sciences | 1998-02We present a new set of accurate formulae for the computation of random errors in the measurement of atomic and molecular line-strength indices. The new expressions are in excellent agreement with numerical simulations. We have found that, in so[...]
