Assigned ID: 33 ----- Attempting Submission 1 (Fri Feb 29 20:16:58 GMT 2008) ----- Phase I Proposal 33 (cyc17_1.apt) successfully submitted. ----- Attempting Submission 2 (Wed Mar 05 18:16:49 GMT 2008) ----- Phase I Proposal 33 (cyc17_1.apt) successfully submitted. ----- Attempting Submission 3 (Fri Mar 07 19:05:47 GMT 2008) ----- This is a Calibration Archival proposal to develop, implement, and test enhancements to the pipeline wavelength scales of STIS echelle spectra, to take full advantage of the extremely high performance of which the instrument is capable. The motivation is a recent extensive investigation--The Deep Lamp Project--which identified systematic wavelength distortions in all 44 primary and secondary settings of the four STIS echelle modes: E140M, E140H, E230M, and E230H. The method was to process deep exposures of the onboard Pt/Cr-Ne calibration source as if they were science images, and measure deviations of the lamp lines from their laboratory wavelengths. An approach has been developed to correct the distortions post facto, but it would be preferable to implement a more robust dispersion model in the pipeline itself. The proposed study will examine a more extensive set of WAVECALs than in the exploratory Deep Lamp effort, and will benefit from a new laboratory line list specifically for the STIS lamps. Ironing out the wrinkles in the STIS wavelength scales will impact many diverse science investigations, especially the Legacy Archival project "StarCAT."

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