Abstract
Evolutionary model sequences for (X, Z)=(0.7,4×10−3) are constructed by using the same input physics and programming code as those of Saioet al. (1977). From these results the ages of globular clusters are estimated under the assumption of constant helium abundance (Y=0.3). The results suggest that there is a correlation between age and metal abundance for the globular clusters and that metal enrichment in the Galaxy slowly proceeded in several billion years from the value of the extreme Population II stars to that of the Population I stars. Comparison with some models of chemical evolution of galaxies is briefly made.
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References
Allen, C. W.: 1973,Astrophysical Quantities, The Athlone Press, London.
Arp, H. C.: 1962,Astrophys. J. 135, 311.
Arp, H. C. and Hartwick, F. D. A.: 1971,Astrophys. J. 167, 499.
Butler, D.: 1975,Astrophys. J. 200, 68.
Cannon, R. D.: 1974,Monthly Notices Roy. Astron. Soc. 167, 551.
Canterna, R.: 1975,Astrophys. J. Letters 200, L63.
Christy, R. F.: 1973, in H.-Y. Chiu and A. Muriel (eds.),Stellar Evolution, MIT Press, Cambridge, p. 173.
Cox, A. N. and Stewart, J. N.: 1969,Scientific Information (USSR)15, 3.
Dickens, R. J.: 1970,Astrophys. J. Suppl. 22, 249 (No. 189).
Dickens, R. J. and Rolland, A.: 1972,Monthly Notices Roy. Astron. Soc. 160, 37.
Eggen, O. J., Lynden-Bell, D., and Sandage, A.: 1962,Astrophys. J. 136, 748.
Hartwick, F. D. A.: 1968,Astrophys. J. 154, 475.
Hartwick, F. D. A. and Van den Berg, D. A.: 1973,Astrophys. J. 185, 887.
Hartwick, F. D. A. and Hesser, J. E.: 1974,Astrophys. J. Letters 194, L129.
Hauck, B. and Magnenat, P.: 1975,Dudley Obs. Rep. 9, 171.
Helfer, H. L., Wallerstein, G., and Greenstein, J. L.: 1959,Astrophys. J. 129, 700.
Iben, I., Jr. and Rood, R. T.: 1970,Astrophys. J. 159, 605.
Isobe, S.: 1974,Astron. Astrophys. 36, 333.
Matsuda, T.: 1970,Prog. Theor. Phys., Kyoto 43, 1491.
McClure, R. D. and Osborn, W.: 1974,Astrophys. J. 189, 405.
Menzies, J.: 1973,Monthly Notices Roy. Astron. Soc. 163, 323.
Norris, J.: 1974,Astrophys. J. 194, 109.
Osborn, W.: 1973,Astrophys. J. 186, 725.
Pagel, B. E. J.: 1967, in M. Hack (ed.),Trieste Colloquium on Late Type Stars, p. 133.
Peytremann, E.: 1974,Astron. Astrophys., Suppl. 18, 81.
Rosino, L.: 1973, in J. D. Fernie (ed.),Variable Stars in Globular Clusters and in Related Systems, Reidel, Dordrecht, p. 51.
Saio, H., Shibata, Y., and Simoda, M.: 1977,Astrophys. Space Sci. 47, 151 (Paper I).
Sandage, A.: 1969,Astrophys. J. 157, 515.
Sandage, A.: 1970,Astrophys. J. 162, 841.
Talbot, R. J. and Arnett, W. D.: 1971,Astrophys. J. 170, 409.
Tifft, W. G.: 1963,Monthly Notices Roy. Astron. Soc. 126, 209.
Wallerstein, G. and Helfer, H. L.: 1966,Astron. J. 71, 350.
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Saio, H. Ages of globular clusters. II. Astrophys Space Sci 50, 93–103 (1977). https://doi.org/10.1007/BF00648522
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DOI: https://doi.org/10.1007/BF00648522