EUV Observations with the Hopkins Ultraviolet Telescope: Results from Astro-1

Astronomy and Astrophysics – Astronomy

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Scientific paper

In December 1990, the Hopkins Ultraviolet Telescope (HUT) flew on board the space shuttle Columbia as part of the Astro-1 mission. During the nine-day mission, HUT carried out a highly successful program of moderate resolution spectrophotometry of a wide variety of astronomical objects in both the far and extreme ultraviolet bands. Though HUT was designed primarily for observations in the 912--1860 Angstroms range (in particular for the little studied 912--1216 Angstroms region between the Lyman limit and Lyman alpha ), the design provided a significant capability for observations at EUV wavelengths from 420--912 Angstroms as well. Accordingly, a portion of HUT's observing time during the Astro-1 mission was devoted to spectroscopy of known or suspected EUV sources. These included the hot DA white dwarfs G191-B2B and HZ43 (ideal backdrops for an absorption study of the local interstellar medium), the active chromospheric/coronal emitters Capella and HR1099, the Io plasma torus, and the earth's upper atmosphere. The results obtained from HUT's EUV observations of these objects will be described.

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