Imaging of UV Bright Stars in Metal Rich Globular Clusters

Details Imaging of UV Bright Stars in Metal Rich Globular Clusters Imaging of UV Bright Stars in Metal Rich Globular Clusters

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5714r&link_type=abstract

HST Proposal ID #5714

Physics

Hst Proposal Id #5714 Galaxies &Amp, Clusters Stellar Populations

Scientific paper

Reshoot proposal for GO 3804. Metal rich Galactic globular clusters and a field in the Galactic Bulge will be imaged in the UV and V bands to search for ultraviolet bright stars. Images will be obtained in the Wood's Filter (F160BW), F218W (a wide U) and a short image in the F555W (Wide V) filter to obtain positions for and verify any UV-bright stars detected. Effective temperatures and bolometric luminosities will be determined for these UV bright stars. Their num- bers relative to the total cluster luminosity will determine constrain their evolutionary life times. It is predicted that metal rich system may contain UV-bright stars of 100-1000 Lsun and 10^6 - 10^7 yr life- times; they would 1/10 as numerous as HB stars, but there should be between 3 and 30 such stars per cluster. Similar objects may explain the ultraviolet rising flux seen in giant elliptical galaxies, an unexplained hot population that is stronger in metal rich galaxies.

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