Isochrone - Lines in an H-R diagram occupied by stars of different masses but the same age
Isotopes - Nuclei with the same number of protons but different numbers of neutrons
Isotropic - Looking the same in all directions ...
A babe compared to Sol, analysis of isochrones suggests that BE Ceti may only be around 600 million years old (Messina and Guinan, 2003; and Guinan et al, 1999).
Globular clusters : old, halo, metal poor
Open clusters : young, disk, metal rich
Cluster H-R diagrams : isochrones (same age)
Young cluster isochrones
Main Sequence Turn Off point (MSTO)
measuring cluster age from MSTO ...
Recently the Padova models (actually the isochrones from Bertelli et al. 1994 A&AS 97, 851 with the Worthey stellar models) became similarly available. The STScI group also has a WWW library of young population models.
Constant volume. [H76]
Isochrones
Time-constant loci. [H76]
Isoelectronic Sequence ...
The color-magnitude diagram is almost identical to the Hertzsprung-Russell diagram, but with color replacing the temperature, and magnitude replacing the absolute luminosity. The age of the cluster can be determined by fitting isochrones to the ...
 See also: Mass, Solar, Star, Luminosity, Light
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