Faint Object Spectrograph (FOS) early performance

Astronomy and Astrophysics – Astronomy

Scientific paper

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Faint Objects, Hubble Space Telescope, Spaceborne Telescopes, Spectral Resolution, Spectrographs, Aberration, Lyman Alpha Radiation, Magnetic Shielding, Point Spread Functions, Spaceborne Astronomy

Scientific paper

The on-orbit performance of the HST + FOS instrument is described and illustrated with examples of initial scientific results. The effects of the spherical aberration from the misfiguring of the HST primary mirror upon isolated point sources and in complex fields such as the nuclei of galaxies are analyzed. Possible means for eliminating the effects of spherical aberration are studied. Concepts include using image enhancement software to extract maximum spatial and spectral information from the existing data as well as several options to repair or compensate for the HST's optical performance. In particular, it may be possible to install corrective optics into the HST which will eliminate the spherical aberration for the FOS and some of the other instruments. The more promising ideas and calculations of the expected improvements in performance are briefly described.

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