Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3448r&link_type=abstract
HST Proposal ID #3448
Other
Hst Proposal Id #3448
Scientific paper
FOS ultraviolet spectroscopy of a sample of early-type galaxies with redshift in the range from 0.15 to 0.37 is proposed to determine the evolution with lookback time of the ``UV rising branch'commonly exhibited by nearby elliptical galaxies. This feature can be attributed to various types of old, hot stars in advanced evolutionary stages. The most promising of these hot star candidates appear to be hot, super metal rich horizontal branch stars, in combination with ``Post-early-AGB' stars; other candidates include various types of binary stars, in particular accreting white dwarfs. Among the various complications of the problem, one attractive characteristics however exist: the strength and slope of UV rising branch is predicted to evolve very rapidly with redshift, and in a few Gyr lookback time the rest frame (1550A-V) color should have reddened by over one magnitude. The proposed observations provide an elegant way of indeed checking the nature of the hot stars present in ellipticals, while at the same time opening the way to a first attempt at directly measuring the lookback time to galaxies at low to moderate redshifts.
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