On some Uncertainties in Evolutionary Synthesis Models

Details On some Uncertainties in Evolutionary Synthesis Models On some Uncertainties in Evolutionary Synthesis Models

2001-09-11

arxiv.org/abs/astro-ph/0109169v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, contribution to "Observed HR diagrams and stellar evolution", T.Lejeune and J. Fernandes (eds) with .sty f

Scientific paper

Ranging from track interpolation techniques through model atmospheres to the stochastic nature of the IMF, there are many uncertainties which need to be taken into account when modelling HR diagrams or performing population synthesis, particularly if comparison with actual data is sought. In this paper, we highlight (1) the problem of discontinuities along evolutionary tracks of massive stars (M> 8 Mo), showing that inconsistencies appear in the computation of the corresponding isochrones, and (2) the sampling fluctuations produced by the stochastic nature of the IMF, presenting a statistical formalism to estimate the dispersion in any given observable of a stellar population due to sampling effects which bypasses the need of performing Monte Carlo simulations.

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