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Observations involving the iodine cell require additional calibration frame.
It is an exposition of the halogen (flatfielding) lamp taken with the I cell
in the optical path. This exposition should be done with the same settings
(slit, echelle format, etc.) ast the science spectra. Alternatively, such
a calibration can be done during the night by observing a bright,
early-type, rapidly rotating star, such that there are no sharp features
in the stellar spectrum, only rotationally broadened hydrogen and helium
lines.
At present, control of the I cell and light monitor is possible only
with the instrument control computer (OBCP).
Next: Characteristics of the Data
Up: Observing
Previous: Calibration Data
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aoki, helminiak, tajitsu
2014-02-11