Abstract
ON April 3, 4 and 5, 1975 the star Sirius (α CMa) was observed with the soft X-ray detector aboard the Astronomical Netherlands Satellite (ANS). The instrument consists of a parabolic collecting mirror which has at its focus a proportional counter with a 3.6-µm polypropylene window. It responds to X rays in the photon energy range 0.284–∼ 0.2 keV. The projected area is 144 cm2 which, allowing for reflectivity, counter efficiency and so on, leads to a sensitive area of about 25 cm2 at the carbon absorption edge (0.284 keV). The field of view is 34′ FWHM circular. Further instrumental details are given in refs 1ndash;3.
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References
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MEWE, R., HEISE, J., GRONENSCHILD, E. et al. Soft X rays from Sirius. Nature 256, 711–712 (1975). https://doi.org/10.1038/256711a0
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DOI: https://doi.org/10.1038/256711a0
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