Interstellar 12C/13C ratios (C

Details Interstellar 12C/13C ratios (C Interstellar 12C/13C ratios (C

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ycat..34410181c&link_type=abstract

VizieR On-line Data Catalog: J/A+A/441/181. Originally published in: 2005A&A...441..181C

Physics

Scientific paper

The 12C/13C isotope ratio is a tracer of stellar efficiency of mixing in the ISM. 12CH+/13CH+ is not affected by interstellar chemistry, and is the most secure way of measuring 12C/13C in the diffuse ISM. R=12C/13C is 90 in the solar system. Previous measurements of 12CH 3957.7,4232.3 and 13CH 3958.2,4232.0 absorption toward nearby stars indicate some variations in 12C/13C, with values ranging from 40 to 90 suggesting inefficient mixing. Except for the cloud toward Oph, these R values are strongly affected by noise. With UVES on the VLT we have improved on the previous interstellar 12C/13C measurements.
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