Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546317l&link_type=abstract
American Astronomical Society, AAS Meeting #215, #463.17; Bulletin of the American Astronomical Society, Vol. 42, p.497
Astronomy and Astrophysics
Astronomy
Scientific paper
The Space Telescope Imaging Spectrograph (STIS) Next Generation Spectral Library (NGSL) contains UV-optical spectra (0.2 to 1.0 microns) of 374 stars having a wide range in temperature, luminosity, and metallicity (http://archive.stsci.edu/prepds/stisngsl/). These spectra were obtained without centering the star in the 0.2 arcsecond slit. Mis-centering resulted in up to 10% errors in the calibrated flux. With the recent repair of STIS, we were able to obtain calibration data to characterize the wavelength-dependent throughput of the 0.2” slit versus the target's position within the slit. To apply this information, we first determined the amount by which each NGSL star is mis-centered using the location of fringes in the long wavelength (G750L) spectra (compared to the fringes in a reference tungsten flat). We were then able to derive the absolute flux distribution of each NGSL star.
Support for Program numbers HST-AR-11755 and HST-GO-11652 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555.
Heap Sally
Lindler Don
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