J/A+A/441/181 Interstellar 12C/13C ratios (Casassus+, 2005)
Interstellar 12C/13C ratios through CH+λλ3957,4232
absorption in local clouds: incomplete mixing in the ISM.
Casassus S., Stahl O., Wilson T.L.
<Astron. Astrophys., 441, 181 (2005)>
=2005A&A...441..181C 2005A&A...441..181C (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds
Keywords: ISM: abundances - ISM: clouds - ISM: molecules -
ISM: individual objects: Coalsack -
ISM: individual objects: Lupus cloud -
ISM: individual objects: zeta Oph cloud
Abstract:
The 12C/13C isotope ratio is a tracer of stellar yields and the
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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Author's address: Simon Casassus,
(End) Patricia Vannier [CDS] 08-Nov-2005