Far-ultraviolet spectra of the nuclei of globular clusters M30, M54, M70

Details Far-ultraviolet spectra of the nuclei of globular clusters M30, M54, M70 Far-ultraviolet spectra of the nuclei of globular clusters M30, M54, M70

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..485c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 485-492.

Astronomy and Astrophysics

Astronomy

11

Astronomical Spectroscopy, B Stars, Far Ultraviolet Radiation, Globular Clusters, Horizontal Branch Stars, Sagittarius Constellation, Ultraviolet Spectra, Asymptotic Giant Branch Stars, Hertzsprung-Russell Diagram, Iue, Normal Density Functions, Spaceborne Astronomy

Scientific paper

IUE spectra in the low dispersion mode have been collected from the nuclei of the three galactic globular clusters NGC 6681 (= M70), NGC 6715 (= M54), and NGC 7099 (= M30). High UV fluxes are obtained from M54 which had been found earlier to be a real characteristic of the cluster population, suggesting a possible connection of this cluster with EB clusters as defined by van Albada et al. (1981). Although the B and EB clusters anticorrelate as groups with metallicity, the flux level in M70 suggests that within the EB group UV colors and metallicity are again correlated. A point-like UV source has been detected at the center of M30. Separation between the central source and the diffuse cluster background radiation has been achieved through a multi-Gaussian best-fit procedure. The diffuse component shows the behavior of B-type clusters, in accordance with ANS data. The point-like source is shown to be a star in a post-HB phase crossing the HR diagram towards the asymptotic giant branch.

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