Ultraviolet Properties of the Metal Rich M87 Globular Cluster System

Details Ultraviolet Properties of the Metal Rich M87 Globular Cluster System Ultraviolet Properties of the Metal Rich M87 Globular Cluster System

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8643o&link_type=abstract

HST Proposal ID #8643

Physics

Hst Proposal Id #8643 Galaxies

Scientific paper

We propose to use STIS imaging to obtain far-ultraviolet photometry of the metal rich globular cluster system of the elliptical galaxy M87. This system represents a key link between the well understood populations of the clusters and the hot stars in elliptical galaxies, where our physical insight is presently limited. Our goal is to establish the relationship between cluster metal abundance and the production of UV-bright populations of stars on the ``extreme horizontal branch'' at T{eff} > 16000K. These stars are the source of the surprising ``ultraviolet-upturn'' phenomenon in elliptical galaxies. Our observations will fill a major gap in the present coverage of cluster metal abundances. This would be an important step in understanding the dependence of the upturn on its parent stellar population. A basic motivation is the expectation that the UV-upturn could be the most sensitive probe of the ages and abundances of elliptical galaxy populations. We plan to observe 3 fields in M87, which will provid e a sample of 30-50 UV-detected objects in the brightest 3 magnitudes of its cluster luminosity function. The program is technically challenging but appears feasible. Relatively long integrations are needed, under conditions of minimum dayglow emission from Earth's atmosphere.

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