Narrow diffuse interstellar bands: A survey with precise wavelengths

We present an atlas of 271 diffuse interstellar bands (DIBs) between 4460 a nd 8800 Angstrom based on echelle spectra (R = 45,000), of which more than 100 are new DIBs discovered in this survey. The atlas is restricted mostly to narrow features, and we describe the tests for an interstellar origin, T he rest wavelength of each DIB was determined in a high-quality composite s pectrum of the star HD 23180 using the interstellar Na I (D1 and D2) lines to establish the radial velocity of the single intervening cloud. DIB wavel engths are quoted to 0.01 Angstrom and are probably accurate to similar to 0.1 Angstrom. Other, weak DIBs found in the spectra of heavily reddened sta rs are included with a lower wavelength precision.