CH+ IN THE INTERSTELLAR-MEDIUM

被引：37

作者：

ALLEN, MM

机构：

[1] Department of Physics and Astronomy, Johns Hopkins University, Baltimore

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 424卷 / 02期

关键词：

ISM; ABUNDANCES; MOLECULES; SHOCK WAVES;

D O I：

10.1086/173928

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This paper describes observations of interstellar CH+ along the lines of sight to O and B stars with E(B - V)s up to +1.13. Along some lines of sight with strong detections of CH+, we find distinct radial velocity shifts between the CH+ lines and other neutral species, such as Ca I and CH. The shifts are small but are predicted by shock models of CH+ formation in which the shock is inclined with respect to the observer. We have also found no column densities exceeding approximately 10(13.8) cm-2. When these data are examined along with other CH+ data collected from the literature, the previously seen tendency of CH+ column density to increase with E(B - V) does not continue beyond reddenings of about +0.6. These findings offer support to the shock model of CH+ formation for at least some lines of sight.

引用

页码：754 / 762

页数：9

共 44 条

[1] INTERSTELLAR ABSORPTION ALONG THE LINE OF SIGHT TO THETA-CARINAE USING COPERNICUS OBSERVATIONS [J].