Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt........13c&link_type=abstract
Ph.D. Thesis California Univ., Berkeley.
Astronomy and Astrophysics
Astronomy
Stellar Radiation, Ultraviolet Radiation, Calibrating, Flux (Rate), Grazing Incidence Telescopes, Hydrogen, Imaging Techniques, Spaceborne Astronomy, Structural Design, Telescopes, Temperature Measurement, White Dwarf Stars
Scientific paper
The design, calibration and launch of a rocket-borne imaging telescope for extreme ultraviolet astronomy is described. The telescope employed diamond-turned grazing incidence optics and a ranicon detector. Upper limits ten to twenty times more sensitive than previously available were obtained for the extreme ultraviolet flux from the white dwarf Sirius B. These limits fall a factor of seven below the flux predicted for the star and demonstrate that the temperature of Sirius B is not 32,000 K as previously measured, but is below 30,000 K. The new upper limits also rule out the photosphere of the white dwarf as the source of the recently reported soft X-rays from Sirius. Two other white dwarf stars, Feige 24 and G191-B2B, were observed. Upper limits on their flux at 300 Angstrom were interpreted as lower limits on the interstellar hydrogen column densities to these stars. The lower limits indicate interstellar hydrogen densities of greater than .02 cm to the -3 power.
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