Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12280a&link_type=abstract
HST Proposal ID #12280. Cycle 18
Computer Science
Scientific paper
This is a calibration proposal that addresses a significant obstacle to ongoing efforts to enhance the quality of the dispersion solutions implemented in the STIS echelle pipeline. Namely, the wavecal material representing many of the secondary grating "tilts" is in relatively poor shape. With solid lamp calibrations in all 37 supported high-res {E140H and E230H} settings, STIS itself can be exploited to bootstrap {by means of an empirical wavelength distortion correction} a "laboratory calibration" to the many lines emitted by the STIS lamps, mainly chromium, that were missing from the GHRS flight-spare units originally measured at NIST in the 1990's, and more recent work with STIS-type lamps that unfortunately only covers the FUV band. The prototype distortion correction significantly improves the quality of the pipeline spectra, to the great benefit of the many types of GO programs that require accurate velocity measurements - stellar, interstellar, and even intergalactic - and thus have turned to STIS in the past. {And now again, during its "second life."} The proposed exposure depth enhancements for the 28 {of 44} tilts require seven orbits, with no impact on science time. The total exposure duration {10 hours} is only 1/4 that already expended on "deep" wavecals {texp>60 s}, and essentially would complete the fundamental wavelength calibration of this enormously valuable spectroscopic machine. The program should have negligible impact on lamp life, which is measured in many hundreds of hours.;
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