Hot UV bright stars in globular clusters

Details Hot UV bright stars in globular clusters Hot UV bright stars in globular clusters

1998-03-27

arxiv.org/abs/astro-ph/9803313v1

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, to be published in A&A, l-aa.sty

Scientific paper

We have obtained medium-resolution spectra of seven UV-bright stars discovered on images of four southern globular clusters obtained with the Ultraviolet Imaging Telescope (UIT). Effective temperatures, surface gravities and helium abundances are derived from LTE and non-LTE model atmosphere fits. Three of the stars have sdO spectra, including M4-Y453 (Teff = 58800 K, log g = 5.15), NGC 6723-III60 (Teff = 40600 K, log g = 4.46) and NGC 6752-B2004 (Teff = 37000 K, log g = 5.25). All seven stars lie along either post-extended horizontal branch (EHB) or post-early AGB evolutionary tracks. The post-early AGB stars show solar helium abundances, while the post-EHB stars are helium deficient, similar to their EHB progenitors.

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