Other
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1748a&link_type=abstract
IUE Proposal ID #GCGBA
Other
Scientific paper
Recent theoretical attempts to understand the evolution of Population II stars have met with some success in accounting for certain features seen in globular cluster color magnitude diagrams. In particular, model evolutionary tracks have been published that connect the low luminosity subclass of UV-bright stars to direct evolution off the blue end of the horizontal branch and the high luminosity group to evolution, following the second ascent of the giant branch. However, relative to such well defined sequences, as the horizontal and first red giant branches there, is a great deal of scatter, among the UV-bright stars, when they are plotted on a composite CMD; these are rare stars and the sample is incomplete. We propose to observe a sample of globular clusters for which no IUE spectra exist, and several others for which inadequate exposures were obtained. UV-bright stars are most frequently found in clusters with blue horizontal branches, and the clusters we have selected are all of this type. Archival SWP images of UV-bright stars in several such clusters suggest a bimodal luminosity distribution in accord with the division into low and high luminosity groupings predicted by theory. Further observations are necessary to confirm this result. Many UV-bright stars show a broad absorption feature suggestive of advanced evolution, i.e., Population I abundances.
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