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Title:
Ages of globular clusters from their luminosity functions
Authors:
Paczynski, B.
Affiliation:
AA(Polska Akademia Nauk, Centrum Astronomiczne, Warsaw, Poland; Princeton University, New Observatory; Institute for Advanced Study, Princeton, NJ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 670-674. (ApJ Homepage)
Publication Date:
09/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Functions (Mathematics), Globular Clusters, Stellar Evolution, Stellar Luminosity, Chemical Composition, Hertzsprung-Russell Diagram
DOI:
10.1086/162449
Bibliographic Code:
1984ApJ...284..670P

Abstract

The luminosity function near the turnoff point depends on the age and composition of stars in a cluster. It has a number of advantages over the H-R diagram for comparing stellar models with observations. The luminosity function is not affected by the uncertainties in mixing length parameter and complicated low-temperature opacities. It should be possible to obtain bolometric luminosities from multicolor observations without any reference to model atmospheres. A number of theoretical luminosity functions are presented to illustrate their dependence on age and chemical composition. It is proposed that not only H-R diagrams but also luminosity functions should be used to estimate ages of globular clusters and their uncertainty.

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