Scattered Light Characteristics of the Hubble Space Telescope Faint Object Spectrograph (SV #1319)

Details Scattered Light Characteristics of the Hubble Space Telescope Faint Object Spectrograph (SV #1319) Scattered Light Characteristics of the Hubble Space Telescope Faint Object Spectrograph (SV #1319)

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.6907b&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #69.07; Bulletin of the American Astronomical Society, Vol. 24, p.1231

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Observations of a standard star (BD+75D325) have been used to measure the Hubble Space Telescope (HST)/ Faint Object Spectrograph (FOS) scattering characteristics in the wavelength range 115 to 250 nm. Spectra of the standard star were obtained as the star was progressively offset from the optical line of sight axis of the telescope, both in the in-dispersion and cross-dispersion directions. These data have been reduced and analyzed to determine the scattering function of the telescope-spectrograph combination. Two primary results have been obtained. (1) The resulting scattering function exhibits three characteristics: (a) The inner core (theta < 4") is dominated by the large PSF of the HST; (b) the outer wings of the scattering function (4" < theta < 32") show a theta (-3) dependence consistent with predictions for the HST Airy disc; and (c) The wavelength dependence of this scattering function follows lambda (-1) , suggesting that the UV micro roughness contribution to the scatter is quite small, and hence the HST primary mirror is very smooth at ultraviolet wavelengths. (2) The FOS scattering contribution is limited only by grating scatter, and is consistent with pre-launch grating calibration measurments. As a result, both the scatter contribution from the HST mirror surface micro roughness and the FOS gratings appears to be within their design specifications. We also describe the implications of these results for FOS on achieving its limiting performance for certain typical observations.

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