Harry Ferguson

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We describe the procedure for obtaining a MAMA detector anode fold analysis. The procedure for cycle-7 is revised from the SMOV procedure (TIR 97-09) to use the line lamps with neutral density filters in an undispersed mode. In all other respects it is the same as the SMOV procedure. This revision corrects minor inconsistencies with the phase-2 proposal(More)
The installation of the Aft Shroud Cooling System (ASCS) on the next HST servicing mission will increase the scientific productivity of STIS by reducing the dark current in the MAMA detectors. The " dark glow " now observed in the FUV-MAMA detector is expected to go away at the ~24 ο C nominal operating temperature after SM3. For the NUV-MAMA, typical dark(More)
Ground-based adaptive optics (AO) in the infrared has made exceptional advances in approaching space-like image quality at higher collecting area. Optical-wavelength applications are now also growing in scope. We therefore provide here a comparison of the pros and cons of observational capabilities from the ground and from space at optical wavelengths. With(More)
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The STIS CCD exhibits fringing in the near-IR which limits the signal-to-noise obtainable at wavelengths longward of 7000 A in the G750L and G750M spectral modes. The fringing can be largely rectified by the application of a flat field (a so called 'fringe flat') taken contemporaneously with the science data, without allowing motion of the Mode Select(More)
Users may access full items free of charge; copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational or not-for-profit purposes without prior permission or charge, provided: • The authors, title and full bibliographic details is credited in(More)