Using my Lick index analysis tool and my Lick models, I have analysed
indices given for M67.
The models are based on the empirical calibrations of Worthey et al.
(1994, 1997). Both my models and my analysis method are described in
& Fritze-v. Alvensleben 2006, A&A 457, 467.
My results for M67 give an age of 5.52(+-0.2) Gyrs and a metallicity of
I have attached a figure
showing a comparision of my "best fitting" model
and the given measurements by plotting the respective index strengths
can explain it in depth - just note that only the indices with error
bars which I took from the corresponding paper were taken into account
for the analysis). It shows how well the measurements are reproduced by