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Fig. 18

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HCN production rates (upper panel) and line velocity shifts (lower panel) derived from the AOSA (blue circles), AOSB (red squares), and CTSB (black triangles) spectrometers as a function of time in comet C/2002 T7 (LINEAR) with 1-σ uncertainties. The unit of time in the horizontal axis is UT decimal days in May 2004 and the time resolution is about 4 min (integration of 2 min at the on-source and off-source positions with 15 s samples plus a small overhead from telescope movement in the position-switching observing mode). Gaps in the time coverage of our observations are indicated by the dotted lines in the horizontal axes. Filled symbols designate spectra that were obtained with a system temperature that was more than 1-σ away from the mean system temperature during the adjacent scans.

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