10 Lac (O9V) Spectral Atlas with HST/GHRS ("10LAC")

An ultraviolet atlas of 10 Lacertae constructed by members of the HST Goddard High Resolution Spectrograph (GHRS) scientific development and calibration teams. The star 10 Lac was chosen because it is unique as a bright O (O9V) star exhibiting a very sharp-lined spectrum. As a member of the Lacerta OB1 association, the star is known to have a distance of about 600 pc. The atlas consists of a number of plots of relative flux versus wavelength over the range 1181 -- 1777 Angstroms. The data were recorded by 4:1 substepping the G160M (medium resolution) grating over an angle corresponding to one pixel at the detector. Each pixel corresponds to a spectral resolution element of about 15 km/s. Fluxes of 'continuum pixels' range from 32,000 to 100,000 photon counts across the total spectral range, resulting in a signal-to-noise ratio in excess of 100. The data were recorded over a total time of about 5 hours on 6 November, 1992 through the small science aperture. Note that these observations were done before the installation of the COSTAR corrective optic element. Identifications are given in the atlas for 45 interstellar lines of 17 ions.