Ultraviolet properties of individual hot stars in globular cluster cores. 1: NGC 1904 (M 79)

Astronomy and Astrophysics – Astronomy

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Globular Clusters, Hot Stars, Iue, Mathematical Models, Stellar Cores, Ultraviolet Emission, Ultraviolet Spectra, Data Reduction, Explorer Satellites, Ultraviolet Astronomy

Scientific paper

As part of an observing program using the International Ultraviolet Explorer (IUE) satellite to investigate the ultraviolet properties of stars found within the cores of galactic globular clusters with blue horizontal branches (HBs), we obtained three spectra of the cluster NGC 1904 (M 79). All three were long integration-time, short-wavelength (SWP) spectra obtained at the so called 'center of light' and all three showed evidence of sources within the IUE large aperture (21.4 in. by 10 in.). In this paper we shall describe the analysis of these spectra and present evidence that the UV sources represent individual hot stars in the post-HB stage of evolution.

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