Computer Science
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop12010g&link_type=abstract
HST Proposal ID #12010. Cycle 17
Computer Science
Scientific paper
In this program we will observe the star Sk-155 {an O9b star in the SMC} with the high resolution E140H grating on STIS.Sk-155 was observed with COS during SMOV with the purpose of confirming the spectroscopic resolution of the FUV medium resolution gratings {G130M and G160M}. Comparison of the E140H spectra with the COS spectra shows that the COS spectralresolution is likely significantly impacted by broad non-Gaussian wings in the COS LSF. Further tests and characterization ofthis effect is critical for evaluating the final spectroscopic resolution of COS. However, the existing STIS/E140H spectra ofSk-155 only cover the wavelength range 1165-1350 A {good for testing the G130M spectral resolution}. They do not extendto long enough wavelenghts to test the COS G160M spectral resolution. Therefore, in this supplemental STIS program we willuse 2 HST orbits to re-observe Sk 155 with STIS. We will utilize the E140H grating with the 0.2x0.09 aperture and central wavelength of 1598 Angstroms which covers the missing wavelength range 1500-1700 A.;
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