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IUE observations of blue horizontal branch globular clusters and UV-bright stars
Recent theoretical attempts to understand the later evolution ofpopulation II stars have met with some success in accounting for thepositions of UV-bright stars in globular cluster color magnitudediagrams. In particular, model calculations have been published whichsuggest the existence of two distinct sub-classes of UV-bright star,based on their luminosity above the horizontal branch (HB). IUEobservations of individual UV-bright stars in several globular clustersdo indeed show a separation into two luminosity groups, with more thanhalf of the stars belonging to the high luminosity class. Whereasspectra of resolved hot sources found in the cores of seven clusterslead us to believe that they are also UV-bright stars, unlike the starsoutside the core they fall mostly in the low luminosity group.
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