Abstract
Almost 25 years ago Walter Baade told the Vatican conference about the meaning of stellar populations:
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“We also understand now why the two stellar popualtions, either singly or combined, are such conspicuous features in most galaxies. They are age groups which represent two significant phase of the star formation in galaxies.”
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References
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Hesser, J.E. et al. (1983). Evolution in Old Stellar Populations in Galaxies. In: West, R.M. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7110-3_6
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