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

Eric B. Burgh | Zendy; Stephan R. McCandliss | Zendy; B. G. Andersson | Zendy; P. D. Feldman | Zendy

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

Author(s) -

Eric B. Burgh,

Stephan R. McCandliss,

B. G. Andersson,

P. D. Feldman

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309432

Subject(s) - extinction (optical mineralogy) , stars , astrophysics , physics , curvature , absorption (acoustics) , ultraviolet , linear correlation , spectral line , absorption spectroscopy , astronomy , optics , geometry , statistics , mathematics

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

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