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A sample of 59 sight lines to reddened Galactic OB stars was examined forcorrelations of the strength of the CO Fourth Positive (A - X) absorption bandsystem with the ultraviolet interstellar extinction curve parameters. We usedarchival high-dispersion NEWSIPS IUE spectra to measure the CO absorption forcomparison to parametric fits of the extinction curves from the literature. Astrong correlation with the non-linear far-UV curvature term was found withgreater absorption, normalized to E(B-V), being associated with more curvature.A weaker trend with the linear extinction term was also found. Mechanisms forenhancing CO in dust environments exhibiting high non-linear curvature arediscussed.Comment: 10 pages, including 6 figures. LaTeX2e (emulateapj5.sty). To appear  in ApJ, Sep 20, 200

On the Correlation between CO Absorption and Far‐Ultraviolet Nonlinear Extinction toward Galactic OB Stars