The Einstein On-Line System (EOLS) is a collection of data, software, and documentation from the Einstein Observatory project and is located on a computer at the Smithsonian Astrophysical Observatory. The interface is menu-driven, terminal-independent, and is available via the Internet, SPAN, or telephone dial-up. Using EOLS, astronomers have

Synthetic horizontal branch (HB) stars in globular clusters, when computed on the basis of HB evolutionary tracks and pulsation theory constraints, furnish the best theoretical scenarios for exploration of the age-metallicity relation in globular clusters. Preliminary results are presented from recently computed synthetic models of the horizontal

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