The ultraviolet-bright stars of Omega Centauri, M3, and M13

Details The ultraviolet-bright stars of Omega Centauri, M3, and M13 The ultraviolet-bright stars of Omega Centauri, M3, and M13

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395l..21l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 395, no. 1, p. L21-L24.

Astronomy and Astrophysics

Astronomy

25

Horizontal Branch Stars, Stellar Spectra, Ultraviolet Astronomy, Absorption Spectra, Elliptical Galaxies, Iue, Stellar Atmospheres, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

Two new UV-bright stars detected within 2 arcmin of the center of Omega Cen are spectroscopically investigated with the short-wavelength spectrograph of the IUE. The IUE spectra of the UV-bright stars UIT-1 and UIT-2 in the core of Omega Cen superficially resemble those of Population I mid-B stars. The absorption lines of the core UV-bright stars are significantly weaker than in Population I stars, consistent with their membership in the cluster. Synthetic spectra calculated from low-metallicity Kurucz model stellar atmospheres are compared with the spectra. These objects are insufficiently luminous to be classical hydrogen-burning post-AGB stars. They may be evolved hot horizontal branch stars which have been brightened by more than 3 mag since leaving the zero-age horizontal branch. It is inferred from the spectra and luminosity of the core UV-bright stars that similar objects could provide the source of the UV light in elliptical galaxies.

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