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Title:
Far-ultraviolet radiation from disk globular clusters
Authors:
Rich, R. M.; Minniti, Dante; Liebert, James
Affiliation:
AA(Columbia Univ., New York), AB(Steward Observatory, Tucson, AZ), AC(Steward Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 489-500. (ApJ Homepage)
Publication Date:
04/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Asymptotic Giant Branch Stars, Far Ultraviolet Radiation, Globular Clusters, Metallicity, Ultraviolet Spectra, Cataclysmic Variables, Elliptical Galaxies, Horizontal Branch Stars, Interstellar Extinction, Iue, Stellar Evolution
DOI:
10.1086/172461
Bibliographic Code:
1993ApJ...406..489R

Abstract

IUE spectra obtained in a survey of the metal-rich disk system of globular clusters are presented. Significant FUV fluxes were detected in the 1200-2000-A short-wavelength (SWP) range of the IUE Observatory in several disk globular clusters. These clusters are the most metal-rich known to have an FUV flux. Three clusters show spectral energy distrbutions (SEDs) clearly rising at shorter wavelengths, not unlike the upturns observed in the bulges of metal-rich elliptical galaxies. Several others with weak SWP detections appear to have flat or uncertain spectral energy distributions. Blue stragglers provide a possible explanation for flux redder than 2000 A in clusters showing weaker flux in the SWP region, and with flat or declining SEDs.

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