Abstract
With the aim to test the present capability of the stellar surface lithium abundance in providing an estimation for the age of PMS stars, we analyze the case of the detached, double-lined, eclipsing binary system PAR 1802. For this system, the lithium age has been compared with the theoretical one, as estimated by applying a Bayesian analysis method on a large grid of stellar evolutionary models. The models have been computed for several values of chemical composition and mixing length, by means of the code FRANEC updated with the Trojan Horse reaction rates involving lithium burning.
Highlights
Among the observational parameters, surface lithium abundance is definitely of interest for PreMain Sequence (PMS) late-type stars, which have deep convective envelopes
The Bayesian Method is a statistical powerful tool which allows to obtain an estimation of stellar parameters by comparing observational evidences of other quantities with models’ predictions for the same quantities, and by taking into account the a priori information about metallicity and parameters to be determined, if any
It has to be noted that the accuracy of theoretical evolutionary models in predicting surface abundance of light elements largely relies on both the adopted mixing length parameter and the nuclear reaction rates
Summary
This content has been downloaded from IOPscience. Please scroll down to see the full text. 2016 J. 8th European Summer School on Experimental Nuclear Astrophysics (Santa Tecla School)
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