HST Low Resolution Stellar Library

Understand

Hubble Space Telescope's (HST) Space Telescope Imaging Spectrograph (STIS) targeted 556 stars in a long-running program called Next Generation Spectral Library (NGSL) via proposals GO9088, GO9786, GO10222, and GO13776.

• Exposures through three low resolution gratings provide wavelength coverage from 0.2 $< \lambda <$ 1 $\mu$m at $\lambda/\Delta\lambda\sim$ 1000, providing unique coverage in the ultraviolet (UV).
• The UV grating (G230LB) scatters red light and this results in unwanted flux that becomes especially troubling for cool stars.
• We applied scattered light corrections based on \cite{2022stis.rept....5W} and flux corrections arising from pointing errors relative to the center of the 0\farcs2 slit.