Other
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..754a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 754-762
Other
30
Abundance, Astronomical Models, B Stars, Calcium, Interstellar Matter, Line Spectra, Methylidyne, O Stars, Computer Programs, Density (Mass/Volume), Radial Velocity, Shock Waves, Spectrographs
Scientific paper
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 1013.8/sq cm. When these data are examined along with the 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.
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