The Hopkins Ultraviolet Telescope - Performance and calibration during the Astro-1 mission

Details The Hopkins Ultraviolet Telescope - Performance and calibration during the Astro-1 mission The Hopkins Ultraviolet Telescope - Performance and calibration during the Astro-1 mission

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..264d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 264-271.

Astronomy and Astrophysics

Astronomy

110

Astro Missions (Sts), Calibrating, Spaceborne Telescopes, Spectrographs, Ultraviolet Telescopes, Astronomical Spectroscopy, Extreme Ultraviolet Radiation, Far Ultraviolet Radiation, Mirrors, Spaceborne Astronomy, Spectrophotometry, Stellar Atmospheres

Scientific paper

Results are reported of spectrophotometric observations, made with the Hopkins Ultraviolet Telescope (HUT), of 77 astronomical sources throughout the far-UV (912-1850 A) at a resolution of about 3 A, and, for a small number of sources, in the extreme UV (415-912 A) beyond the Lyman limit at a resolution of about 1.5 A. The HUT instrument and its performance in orbit are described. A HUT observation of the DA white dwarf G191-B2B is presented, and the photometric calibration curve for the instrument is derived from a comparison of the observation with a model stellar atmosphere. The sensitivity reaches a maximum at 1050 A, where 1 photon/sq cm s A yields 9.5 counts/s A, and remains within a factor of 2 of this value from 912 to 1600 A. The instrumental dark count measured on orbit was less than 0.001 counts/s A.

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