GHRS Instrument Science Report 073:
Short-Term Variations in GHRS Response: An Investigation into an Apparent
Anomaly
D. Soderblom, J. Eisenhamer, S. Hulbert, C. Leitherer,
M. McGrath, L. Sherbert, and J. Skapik
May 07, 1996
Abstract
This is a report on an unusual phenomenon seen in a long series of ACCUM observations of a star and of the wavelength calibration lamp. The phenomenon is described, our initial hypotheses are explained and rejected, and further investigations are presented. Our current best hypothesis is that the changes seen in the lamp and star are independent of one another and are due to known effects.
- Short-Term Variations in GHRS Response: An Investigation into an Apparent Anomaly
- Abstract
- 1. - Introduction
- 2. - A Description of the Phenomenon
- 3. - Initial Hypotheses
- Image Motion at the Spectrograph Aperture
- Variations in Lamp Output
- Spectrum Drift within the Detector
- Lyman-alpha Background
- Bright Earth Background
- 4. - Further Investigations
- 5. - Independent Phenomena
- Acknowledgments