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Soft X rays from Sirius

Naturevolume 256pages711712 (1975) | Download Citation



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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    Catura, R. C., Acton, L. W., and Johnson, H. M., Astrophys. J. Lett., 196, L47–L49 (1975).

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  1. Space Research Laboratory, The Astronomical Institute, Beneluxlaan 21, Utrecht, The Netherlands

    • R. MEWE
    • , J. HEISE
    • , E. H. B. M. GRONENSCHILD
    • , A. C. BRINKMAN
    • , J. SCHRIJVER
    •  & A. J. F. DEN BOGGENDE


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