Ultraviolet observations of normal galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Elliptical Galaxies, Spaceborne Astronomy, Spiral Galaxies, Stellar Evolution, Ultraviolet Astronomy, Astronomical Netherlands Satellite, B Stars, Interstellar Extinction, Iue, O Stars, Oao

Scientific paper

Ultraviolet observations of normal galaxies are reviewed with respect to the knowledge of their stellar populations. UV data show that both elliptical galaxies and the bulges of spiral galaxies posses a hot star component of uncertain nature. The importance of a better understanding of the late stages of stellar evolution, both from an observational and a theoretical point, is stressed. In those spiral and elliptical galaxies undergoing a star-burst it is clear that young O- and B-type stars are responsible for the ultraviolet flux. Some recent results for these objects are briefly considered.

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