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Echelle spectra of HD 183143 [B7Iae, E(B-V) = 1.27] were obtained on threenights, at a resolving power R = 38,000 and with a signal-to-noise ratio ~1000at 6400 A in the final, combined spectrum. A catalog is presented of 414diffuse interstellar bands (DIBs) measured between 3900 and 8100 A in thisspectrum. The central wavelengths, the widths (FWHM), and the equivalent widthsof nearly all of the bands are tabulated, along with the minimum uncertaintiesin the latter. Among the 414 bands, 135 (or 33%) were not reported in fourprevious, modern surveys of the DIBs in the spectra of various stars, includingHD 183143. The principal result of this study is that the great majority of thebands in the catalog are very weak and fairly narrow. Typical equivalent widthsamount to a few mA, and the bandwidths (FWHM) are most often near 0.7 A. Nopreferred wavenumber spacings among the 414 bands are identified which couldprovide clues to the identities of the large molecules thought to cause theDIBs. At generally comparable detection limits in both spectra, the populationof DIBs observed toward HD 183143 is systematically redder, broader, andstronger than that seen toward HD 204827 (Paper II). In addition, interstellarlines of C2 molecules have not been detected toward HD 183143, while a veryhigh value of N(C2)/E(B-V) is observed toward HD 204827. Therefore, either theabundances of the large molecules presumed to give rise to the DIBs, or thephysical conditions in the absorbing clouds, or both, must differ significantlybetween the two cases.

Studies of the Diffuse Interstellar Bands. III. HD 183143