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1ST RESULTS FROM THE UHRF - ULTRA-HIGH-RESOLUTION OBSERVATIONS OF INTERSTELLAR CH, CH+ AND CN TOWARDS ZETA-OPHIUCHI

CRAWFORD, IA; BARLOW, MJ; DIEGO, F; SPYROMILIO, J; (1994) 1ST RESULTS FROM THE UHRF - ULTRA-HIGH-RESOLUTION OBSERVATIONS OF INTERSTELLAR CH, CH+ AND CN TOWARDS ZETA-OPHIUCHI. MON NOT R ASTRON SOC , 266 (4) pp. 903-909.

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Abstract

We present ultra-high-resolution observations (R > 700000) of interstellar CH, CH+ and CN towards zeta Oph obtained with the newly commissioned Ultra-High-Resolution Facility (UHRF) at the AAT. The molecular lines have all been fully resolved, and we discuss their implications for this well-studied molecular sightline. The CH and CN lines each consist of two narrow (b almost-equal-to 0.5 km s-1) components separated by 1.13 +/- 0.10 km s-1; an additional broad (b = 1.8 km s-1) component is present in CH. We show that the very broad (b = 2.1 km s-1) CH+ line profile is consistent with the formation of this molecule in warm haloes surrounding the cold cores responsible for the narrow CH and CN components.

Type: Article
Title: 1ST RESULTS FROM THE UHRF - ULTRA-HIGH-RESOLUTION OBSERVATIONS OF INTERSTELLAR CH, CH+ AND CN TOWARDS ZETA-OPHIUCHI
Keywords: LINE PROFILES, STARS INDIVIDUAL ZETA OPH, ISM MOLECULES, VELOCITY STRUCTURE, DIFFUSE CLOUDS, SHOCKS, ABSORPTION, SPECTRUM, SIGHT, LINE
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/263796
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