Calibration of ORFEUS echelle spectrometer

Details Calibration of ORFEUS echelle spectrometer Calibration of ORFEUS echelle spectrometer

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........36g&link_type=abstract

Thesis Tuebingen Univ. (Germany). Astronomisches Inst.

Astronomy and Astrophysics

Astronomy

3

Calibrating, Iue, Line Spectra, Reference Stars, Satellite-Borne Instruments, Spaceborne Telescopes, Spectrometers, Ultraviolet Spectrophotometers, Astro Missions (Sts), Interstellar Extinction, Luminosity, Lyman Spectra, Spaceborne Astronomy, White Dwarf Stars

Scientific paper

A basis is created for spectrophotometric calibration of ORFEUS (Orbiting and Retrieval Far and Extreme Ultraviolet Spectrometer) in Earth orbit. The ORFEUS telescope is onboard ASTRO-SPAS (Shuttle Pallet Satellite) for observing cool and hot stars, active galactic nuclei, and interstellar medium. ORFEUS spectrometer calibration before and after the flight is described. Standard stars which are used for instrument sensitivity and calibration are presented and discussed. Standard stars used for International Ultraviolet Explorer and Hopkins Ultraviolet Telescope are shown to be particularly important. The following aspects, which must be considered in ORFEUS calibration, were discussed: maximal counting rates, standard star systems quality, atmosphere modeling possibilities, observability, acquisition, pointing, and spectra with few lines. These characteristics were used for discussing possible utilization of numerous reference stars which were described in terms of effective temperature, chemical composition, and interstellar reddening. G191 BLB white dwarf star is shown to have the best properties for ORFEUS calibration.

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