The Next Generation Spectral Library (NGSL) is a library of low-dispersion STIS spectra extending from ~0.2-1.0 microns. So far, 378 stars with a wide range in metallicity have been observed. Despite their high S/N>100, many NGSL spectra have 5-10% systematic errors in their spectral energy distributions, which can be traced to throughput variations in the 52x0.2E1 aperture caused by vignetting of a wavelength-dependent asymmetric PSF. We propose to obtain STIS spectra of the HST standard star, BD+75D325, at several positions in the 52x0.2E1 aperture, which will enable us to calibrate the NGSL spectra properly.

We will obtain STIS spectra of the HST standard star, BD+75D325, at several positions in the 52x0.2E1 aperture, which will enable us to calibrate the throughput of the aperture at all wavelengths. This is a 1-orbit calibration observation. UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE 0 true 0.0 0.0 false false false false false AVAILABLE CALIBRATION INSTRUMENT SENSITIVITY TEST This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 08 10 49.4903 +74 57 57.93 J2000 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. Note that a visibility period of 62 minutes is assumed. (Tic-Visit :proposal-id 11652 :visit-id "01" :proposal-version -1 :trans-version "20080609" :date "19-Jun-2008 19:01:16.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 133216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11652 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11652 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3330 :al-overhead-at-end 0 :internal-dur-at-end 646 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3720.0 :pcs-gap 0 ) true 1 0 Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this). Needed to change proposal to AVAILABLE in order to get WAVECAL=NO (need STScI premission to do this).