Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...175...15r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 175, no. 1-2, March 1987, p. 15-22.
Astronomy and Astrophysics
Astrophysics
46
Astronomical Models, Elliptical Galaxies, Galactic Nuclei, Star Formation, Ultraviolet Spectra, Far Ultraviolet Radiation, Magnesium, Spectral Energy Distribution, Spectral Resolution, Star Formation Rate, Stellar Spectra
Scientific paper
Spectra of nuclei for some lenticular and elliptical galaxies observed from the IUE satellite in the far-UV light are analyzed with the help of the IUE spectral atlases using an almost similar resolution for galaxies and stars, down to about 8A for a significant signal/noise ratio. In the 2500A-3150A wavelength range, all gas-poor galaxies show 'recent' star formation, up to F5-F8 stars and a similar mean spectral type F8/G2, estimated from a fit in the continuum as well as in the Mg lines. The corresponding 5 Gyr age of these F8 stars indicates star formation more recent than previously thought about the turn-off point of the classical models of early-type galaxies. The spectral distribution of the gas-rich S0 galaxy NGC 5102 is dominated by an A2 spectral type with contribution of B stars. This confirms the previous results in visible light implying a high star formation rate for this typical 'E + A' galaxy.
Guiderdoni Bruno
Rocca-Volmerange Brigitte
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