Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30..760d&link_type=abstract
American Astronomical Society Meeting, 191, #125.02
Astronomy and Astrophysics
Astronomy
Scientific paper
The globular cluster omega Centauri is unique amongst the galactic globular clusters for several reasons e.g. its abundance spread and its large population of stars. Ultraviolet Imaging Telescope (UIT) observations of omega Cen have found over 1950 far-UV sources most of which are horizontal branch (HB) stars and their progeny. The UIT image together with ground based Stromgren u photometry was used to produce a color magnitude diagram (Whitney et al. AJ 1994, 108, 1350) which shows: (1) a gap around 16000K in the HB, (2) HB stars cooler than the gap agree well with theoretical tracks, (3) some objects hotter than the gap lie below the zero-age HB (sub-HB stars), (4) many post-HB stars which correspond well with stellar theory, (5) a significant population of stars with colors indicating T_e > 50000K. We are using HST/WFPC2 images of 3 selected fields on omega Cen to investigate the features of the hot star population. Observations in the 160W and 555W filters were obtained. Preliminary analysis of the data confirms the population of very hot stars, including post-HB stars and the existence of HB gaps. Comparison of the data to theoretical HB tracks is being carried out.
Bohlin Ralph
D'Cruz N.
Dorman Ben
Hill Reuben
Landsman Wayne
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