SIMBAD references

1998A&A...335..510M - Astronomy and Astrophysics, volume 335, 510-516 (1998/7-2)

Hot UV bright stars in globular clusters.


Abstract (from CDS):

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=58800K, logg=5.15), NGC 6723-III60 (Teff=40600K, logg=4.46) and NGC 6752-B2004 (Teff=37000K, logg=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.

Abstract Copyright:

Journal keyword(s): stars: Post-AGB - globular clusters: individual: NGC 2808, NGC 6121, NGC 6723, NGC 6752 - ultraviolet: stars

VizieR on-line data: <Available at CDS (J/A+A/335/510): stars.dat spectra.dat>

Status at CDS:  

Simbad objects: 18

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