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Libraries of stellar spectra find many uses in astrophysics, from photometriccalibration to stellar population synthesis. We present low resolution spectraof 40 stars from 0.2 micrometers (ultraviolet) to 1.0 micrometers (nearinfrared) with excellent fluxing. The stars include normal O-type stars,helium-burning stars, and post-asymptotic giant branch (PAGB) stars. Spectrawere obtained with the Space Telescope Imaging Spectrograph (STIS) installed inthe Hubble Space Telescope (HST) using three low resolution gratings, G230LB,G430L, and G750L. Cosmic ray hits and fringing in the red were corrected. Acorrection for scattered light was applied, significant only for our cooleststars. Cross-correlation was used to bring the spectra to a common, final, zerovelocity wavelength scale. Finally, synthetic stellar spectra were used toestimate line of sight dust extinction to each star, and a five-parameter dustextinction model was fit, or a one-parameter fit in the case of low extinction.These spectra dovetail with the similar Next Generation Stellar Library (NGSL)spectra, extending the NGSL's coverage of stellar parameters, and extending tohelium burning stars and stars that do not fuse. The fitted dust extinctionmodel showed considerable variation from star to star, indicating variations indust properties for different lines of sight. Interstellar absorption lines arepresent in most stars, notably MgII.

Hot Star Extension to the Hubble Space Telescope Stellar Spectral Library