Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jkas...11....1l&link_type=abstract
Journal of the Korean Astronomical Society, vol. 11, no. 1, p. 1-30
Astronomy and Astrophysics
Astronomy
3
Scientific paper
The four dimensional classification of globular clusters with the parameters, Z, Y, age and HB type is presented defining two new parameters, (B-V)1/2 and S3/2 which are shown to be tightly correlated with Kinman's spectral types and the helium abundances obtained from the R-method, respectively. The Z- and Y-abundances are derived from (B-V)1/2 and S3/2, respectively, and the latter parameters determine the age class of clusters with help of Dickens' HB type, which is a function of Z, Y and age. For the examined forty two globular clusters the computed range of Z and y are 1.5*10E-4 <= Z <= 4.5*10E-2 and 0.23 <= Y <= 0.41. The age difference between the oldest(HB type 1) and the youngest (HB type 7) clusters is roughly estimated to be 2-4*10E9 years. Using these four parameters the known anomalous C-M diagrams seem to be reasonably interpreted without taking into acount some complicate parameters such as unusually overabundant heavy elements, mass loss and mass spread, etc. The four-dimensional scheme strongly suggests the slow successive collapses of the proto-Galaxy rather than a single fast collapse, and by this slow collapse model the inversion of chemical abundance gradient in the Galaxy can be explained. It is also shown that the clump position along the RGB near the HB level removes down to the fainter magnitude as the Z(Y)-abundances increases(decreases).
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