Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7507w&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #75.07; Bulletin of the American Astronomical Society, Vol. 24, p.1242
Astronomy and Astrophysics
Astronomy
Scientific paper
Far-ultraviolet exposures (centroid 1620 Angstroms; bandwidth 225 Angstroms; field of view 40 arcmin diameter) were obtained of the globular cluster omega Cen with the Ultraviolet Imaging Telescope during the Astro-1 mission. These are combined with CCD observations in the Stromgren u band obtained at CTIO to construct an FUV, u color-magnitude diagram. In the FUV, photometry is complete to an apparent FUV magnitude of 17.5, with over 1800 stars detected. This provides a complete sample of hot horizontal branch stars even in the dense core of the cluster. The CMD permits analysis of the HB structure, especially the extreme HB, with very low envelope mass and Te > 20000 K. We also study the FUV and u luminosity functions of the cluster, with particular emphasis on hot stars above the HB.
Bohlin Ralph Charles
Cheng Kwang-Peng
Hintzen Paul M. N.
Landsman Wayne B.
O'Connell Robert West
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