Browsing by Author "de Freitas Pacheco, J. A."
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- ItemA new age-metallicity relation for galactic globular clusters in the alpha-enhanced scenario : cosmological implications.(1992) Catelan , Marcio; de Freitas Pacheco, J. A.Results of an exploratory analysis of the suggestion of Straniero (1991) to obtain, through the Delta(V) method, an age-metallicity for Galactic globular clusters in the alpha-enhanced scenario are presented. A new lower limit is derived for the age of the universe (about 17 Gyr). This value is discussed in the light of other observational constraints in the Hubble parameter-density parameter plane....