Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.125..169s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 125, no. 1, Aug. 1986, p. 169-174.
Astronomy and Astrophysics
Astrophysics
Far Ultraviolet Radiation, Proportional Counters, Reflectance, Rosat Mission, Spaceborne Telescopes, X Ray Telescopes, Background Noise, Baffles, Carbon Fiber Reinforced Plastics, Mirrors, Nickel Alloys
Scientific paper
The results of reflectivity measurements in the vacuum ultraviolet wavelength region (VUV) on technical surfaces are described which are used in the Wolter I-telescope on board the German X-ray astronomy satellite ROSAT. The materials investigated are the special iron-nickel alloy Invar and a carbon fibre compound (CFK). The centre connecting flange for the parabolic and hyperbolic mirror sections of the telescope is made of Invar. CFK is used for the thermal baffle in front of the telescope. It had to be checked whether the structure of the centre flange and the thermal baffle sufficiently suppress scattered ultraviolet radiation in order to avoid a substantial background level in the detectors which are located in the focal plane of the telescope. The detectors consist of two positional sensitive proportional counters (PSPC) with a spatial resolution of 0.5 arc mm and an image converter with a resolution of a few arc sec. The detectors are mounted on a carrousel platform and are intended to be positioned alternatively in the focal plane
Braeuninger Heinrich
Kaase H.
Metzdorf J.
Stephan Karl-Heinz
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