Letter | Published:

Soft X rays from Sirius

Naturevolume 256pages711712 (1975) | Download Citation

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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

  1. 1

    Brinkman, A. C., Heise, J., and de Jager, C., Philips tech. Rev., 34, 43–59 (1974).

  2. 2

    Den Boggende, A. J. F., IEEE Trans. nucl. Sci., 22, 595 (1975).

  3. 3

    Den Boggende, A. J. F., and Lafleur, H. Th. J. A., ibid., 22, 555 (1975).

  4. 4

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

  5. 5

    Latham, D. W., Smithsonian Astrophysical Observatory Special Report 321 (1970).

  6. 6

    Nariai, K., and Klinglesmith, D. A., Proc. third Harvard–Smithsonian Conf. on Stellar Atmospheres (Cambridge, Massachusetts, 1968).

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    Van den Heuvel, E. P. J., Astrophys. J. Lett., 198, L109–L112 (1975).

  8. 8

    Lamers, H. J. G. L. M., thesis, Univ. Utrecht (1974).

  9. 9

    Lamers, H. J. G. L. M., Proc. R. Soc. (in the press).

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Affiliations

  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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https://doi.org/10.1038/256711a0

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