Letter to the Editor
Confidence levels of evolutionary synthesis models
M. Cerviño * 1,2,
V. Luridiana 3 and
F.J. Castander 1
Received 8 June 2000 / Accepted 30 June 2000
The stochastic nature of the IMF in young stellar clusters implies that clusters of the same mass and age do not present the same unique values of their observed parameters. Instead they follow a distribution. We address the study of such distributions, parameterised in terms of their confidence limits, in evolutionary synthesis models. These confidence limits can be understood as the inherent uncertainties of the synthesis models. Here we concentrate on some parameters such as EW(H) in emission. For instance, we show that for a cluster where 105 have been transformed into stars, the dispersion of EW(H) is about 18% within the 90% confidence levels at ages between 3.5 and 5 Myrs.
Key words: Galaxies:Evolution
Send offprint requests to: Miguel Cerviño
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© European Southern Observatory (ESO) 2000
Online publication: July 27, 2000