On the correlation between CO absorption and far-ultraviolet nonlinear extinction toward Galactic OB stars

被引：5

作者：

Burgh, EB ^{[1
]}

McCandliss, SR ^{[1
]}

Andersson, BG ^{[1
]}

Feldman, PD ^{[1
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 541卷 / 01期

关键词：

dust; extinction; ISM : abundances; ISM : molecules; ultraviolet : ISM;

D O I：

10.1086/309432

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A sample of 59 sight lines to reddened Galactic OB stars was examined for correlations of the strength of the CO Fourth Positive (A(1)Pi-X(1)Sigma(+)) absorption band system with the ultraviolet interstellar extinction curve parameters. We used archival high-dispersion NEWSIPS IUE spectra to measure the CO absorption for comparison with parametric fits of the extinction curves from the literature. A strong correlation with the nonlinear far-UV curvature term was found with greater absorption, normalized to E(B - V), being associated with more curvature. A weaker trend with the linear extinction term was also found. Mechanisms for enhancing CO in dust environments exhibiting high nonlinear curvature are discussed.

引用

页码：250 / 256

页数：7

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