J/A+A/441/181ivo://CDS.VizieR/J/A+A/441/181doi:10.26093/cds/vizier.34410181CDSCasassus S.Stahl O.Wilson T.L.CDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmolecular-cloudsThe ^12^C/^13^C isotope ratio is a tracer of stellar yields and the efficiency of mixing in the ISM. ^12^CH^+^/^13^CH^+^ is not affected by interstellar chemistry, and is the most secure way of measuring ^12^C/^13^C in the diffuse ISM. R=^12^C/^13^C is 90 in the solar system. Previous measurements of ^12^CH 3957.7,4232.3 and ^13^CH 3958.2,4232.0 absorption toward nearby stars indicate some variations in ^12^C/^13^C, 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 ^12^C/^13^C measurements. ************************************************************************** * * * Sorry, but the author(s) never supplied the tabular material * * announced in the paper * * * **************************************************************************2005A&A...441..181Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/441/181CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/441/181https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/441/181http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/441/181https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/441/181https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/441/181http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/441/181GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefault