UV-bright stars in galactic globular clusters, their far-UV spectra and their contribution to the globular cluster luminosity

Astronomy and Astrophysics – Astronomy

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Elliptical Galaxies, Far Ultraviolet Radiation, Galactic Clusters, Stellar Luminosity, Spectral Energy Distribution, Stellar Temperature, Ultraviolet Astronomy

Scientific paper

Ultraviolet bright stars in 7 galactic globular clusters were observed with the IUE in the low dispersion mode between 1150 and 3000 A. The stars are: BS in 47 Tuc, vZ1128 in M3, UHB in M5, B29 and IV-52 in M13, I-33 im M10, ROB162 in NGC6397, and K559, K648 and K996 in M15. The spectral energy distributions are used to derive effective temperatures and stellar luminosities. Such stars produce slightly less than 1% of cluster luminosity. Their contribution to the cluster UV intensity varies from 3% at 3300A to 50% at 1200A. In one cluster 60% of the total 1550A intensity comes from the single sdO star.

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