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Far and Extreme Ultraviolet Astronomy with Orfeus

  • G. Krämer (a1), J. Barnstedt (a1), N. Eberhard (a1), M. Grewing (a1), W. Gringel (a1), C. Haas (a1), A. Kaelble (a1), N. Kappelmann (a1), J. Petrik (a1), I. Appenzeller (a2), J. Krautter (a2), H. Mandel (a2), R. Östreicher (a2), S. Bowyer (a3) and M. Hurwitz (a3)...

Abstract

ORFEUS (Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer) is a 1 m normal incidence telescope for spectroscopic investigations of cosmic sources in the far and extreme ultraviolet spectral range. The instrument will be integrated into the freeflyer platform ASTRO-SPAS. ORFEUS-SPAS is scheduled with STS ENDEAVOUR in September 1992. We describe the telescope with its two spectrometers and their capabilities i.e. spectral range, resolution and overall sensitivity. The main classes of objects to be observed with the instrument are discussed and two examples of simulated spectra for the white dwarf HZ43 and an O9-star in the LMC are shown.

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Copyright

References

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Grewing, M., Krämer, G. et al.: 1990, in Malina, R.F. and Bowyer, S., ed(s)., Extreme Ultraviolet Astronomy, Pergamon Press, New York,
Hurwitz, M., Bowyer, S.: 1990, in Malina, R.F. and Bowyer, S., ed(s)., Extreme Ultraviolet Astronomy, Pergamon Press N.Y.,
Krämer, G. et al., 1988, ORFEUS: A 1 m EUV/FUV Telescope on the Space Platform ASTRO-SPAS, in A Decade of UV Astronomy with IUE ESA SP 281, Vol. 2, p. 333
Hurwitz, M., Bowyer, S.: 1988, in, ed(s)., A Decade of UV Astronomy with IUE, ESA SP 281, Vol. 2, 329
Appenzeller, I. et al.: 1988, A Decade of UV Astronomy with IUE, ESA-SP-281, Vol. 2, 337

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