Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-03-17
Astronomy and Astrophysics
Astrophysics
10 pages, 8 figures, LaTex, accepted by Astronomy & Astrophysics
Scientific paper
We have analyzed the far UV-spectrum of the globular cluster M79. We show that the nearly Gaussian mass distribution of zero-age horizontal-branch stars, as derived by Dixon et al.(1996), is able to reproduce the far-UV Hopkins Utraviolet Telescope (HUT) spectrum, if there is a luminous UV-bright star of about an effective temperature of 9,500 K within the HUT entrance slit, or, more likely, if the horizontal branch morphology becomes considerably redder in the core of M79, as observed in some other centrally condensed globular clusters. Agreement between the synthetic and observed far-UV spectra for M79 would also be improved if the surface abundances of the heavy elements in the hot horizontal-branch stars were enhanced by radiative diffusion. Contrary to Dixon et al. (1996) we do not need extremely low gravities to reproduce the width of Ly alpha.
Heap Sara R.
Hubeny Ivan
Lanz Thierry
Sweigart Allen V.
Vink Jorick S.
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