On the Ages of the Galactic Clusters NGC 188, M67 AND NGC 6791

Details On the Ages of the Galactic Clusters NGC 188, M67 AND NGC 6791 On the Ages of the Galactic Clusters NGC 188, M67 AND NGC 6791

Jun 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971bott....6....3t&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 6, pp. 3-14 (1971) (http://www.astroscu.unam.mx/~bott/)

Astronomy and Astrophysics

Astronomy

19

Galaxy: Open Clusters And Associations: Individual(M67, Ngc 188, Ngc 6791), Stars: Abundances, Stars: Color-Magnitude Diagrams, Stars: Evolution

Scientific paper

Theoretical isochrones for three chemical compositions are presented and compared to the color-magnitude diagrams of NGC 188, M67 and NGC 6791. The metal abundances that provide the best agreement between theory and observations for NGC 188 are in the range 0.05 <= Z <= 0.10; this result confirms the "supermetallicity" derived from the spectral features. For NGC 188 an age of 3.6 X 10^9 years was determined assuming E(B - V) = 0.15mag. In the case of M67 the age is in the range of 2 to 3 X 10^9 years; this determination is however very uncertain since the shape of the predicted curves does not correspond to the observed H-R diagram. For NGC 6791 an age of 4 x 10^9 years was estimated.

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