1–1.4 Micron Spectral Atlas of Stars

We present a catalog of J-band (1.08 um to 1.35 um) stellar spectra at lowresolution (R ~ 400). The targets consist of 105 stars ranging in spectral typefrom O9.5 to M7 and luminosity classes I through V. The relatively featurelessspectra of hot stars, earlier than A4, can be used to remove the atmosphericfeatures which dominate ground-based J-band spectroscopy. We measure equivalentwidths for three absorption lines and nine blended features which we identifyin the spectra. Using detailed comparison with higher resolution spectra, wedemonstrate that low resolution data can be used for stellar classification,since several features depend on the effective temperature and gravity. Forexample The CN index (1.096 - 1.104 um) decreases with temperature, but thestrength of a blended feature at 1.28 um (consisting of primarily P beta)increases. The slope of a star's spectrum can also be used to estimate itseffective temperature. The luminosity class of a star correlates with the ratioof the Mg I (1.1831 um) line to a blend of several species at 1.16 um. Usingthese indicators, a star can be classified to within several subclasses.Fifteen stars with particularly high and low metal abundances are included inthe catalog and some spectral dependence on metal abundance is also found.