Is age really the second parameter in globular clusters?

Details Is age really the second parameter in globular clusters? Is age really the second parameter in globular clusters?

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..221v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 221-228. Research supported by NSERC.

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24

Asymptotic Giant Branch Stars, Color-Magnitude Diagram, Globular Clusters, Horizontal Branch Stars, Red Giant Stars, Chronology, Interstellar Extinction, Milky Way Galaxy, Morphology

Scientific paper

From the close similarity of the magnitude difference between the tip of the red giant branch and the turnoff in the Fe/H = about -1.3 globular cluster NGC 288, NGC 362, and M5, it is inferred that the ages of these three systems (and Palomar 5, whose horizonal branch is used to define its distance relative to the others) are not detectably different. An identical conclusion, by similar means, is reached for the Fe/H = about -2.1 globular clusters M15, M30, M68, and M92. Several recent claims that age is responsible for the wide variation in horizontal-branch morphology among clusters of the same metal abundance are not supported.

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