Bertone, E., Chavez, M., Rodriguez-Merino, L., Buzzoni, A.:
"On age and metallicity of evolved stellar populations"
Abstract:
We explore the applicability of updated stellar libraries and synthesis codes in determining the age and
chemical composition of evolved stellar populations from their integrated UV spectra. In this poster paper we present preliminary
results of comparing the UV spectra of two fundamental calibration objects, the Sun and galaxy M32, with a grid of synthetic spectra
of Simple Stellar Populations (SSPs) calculated using the stellar library UVBLUE in the Buzzoni synthesis code. While the
results for these two objects are highly encouraging, there is still to be analyzed if the method is robust enough
to be applied to the analysis of any old population. |
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Chavez, M., Bertone, E., Rodriguez-Merino, L., Buzzoni, A., Bressan, A.:
"Synthetic mid-UV indices of stars and Simple Stellar Populations"
Abstract:
Using the UVBLUE library we have computed all mid-UV spectroscopic indices as defined by Fanelli et al. (1990).
We explore their behaviour in terms of the leading parameters (Teff, log g, [Fe/H]) and
quantify the effect of instrumental resolution on the indices. We briefly discuss the extent to which synthetic indices
are compatible with those measured in observed spectra. We also explore the incorporation of UVBLUE in two population
synthesis codes (Buzzoni 1989; Bressan et al. 1994), producing a grid of integrated mid-UV spectra of SSPs
that span in age from 10 Myr to 20 Gyr and from Z = 0.0001 to 0.1 in metal content.
The effect of these two paramenters on the integrated SSP indices is analyzed.
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