 |
 |
Astron. Astrophys. 360, L5-L8 (2000)
Letter to the Editor
Confidence levels of evolutionary synthesis models
M. Cerviño * 1,2,
V. Luridiana 3 and
F.J. Castander 1
1 Observatoire Midi-Pyrénées, 14, avenue Edouard Belin, 31400 Toulouse, France
2 Centre d'Etude Spatiale des Rayonnements, CNRS/UPS, B.P. 4346, 31028 Toulouse Cedex 4, France
3 Instituto de Astronomía, UNAM, Apdo. Postal 70-264, 04510 México D.F., México
Received 8 June 2000 / Accepted 30 June 2000
Abstract
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![[FORMULA]](img1.gif)
) in
emission. For instance, we show that for a cluster where
105 ![[FORMULA]](img2.gif)
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
Correspondence to: mcervino@obs-mip.fr
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. Synthesis code and the Initial Mass Function
- 3. Distribution of observed parameters: confidence levels
- 4. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: July 27, 2000
helpdesk.link@springer.de