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We analyzed the CI lines associated with the damped Ly-alpha system observedat zabs = 1.15 in the spectrum of HE 0515-4414 to derive the 12C/13C ratio. Thespectrum was obtained by means of the UV-Visual Echelle Spectrograph (UVES) atthe ESO Very Large Telescope (VLT). The obtained lower limit 12C/13C > 80(2sigma C.L.) shows for the first time that the abundance of 13C in theextragalactic intervening clouds is very low. This rules out a significantcontribution from intermediate-mass stars to the chemical evolution of mattersampled by this line of sight. The estimated low amount of 13C is in agreementwith low abundances of nitrogen observed in damped Ly-alpha systems - theelement produced in the same nuclear cycles and from about the same stars as13C.Comment: 4 pages, 3 figures, published in A&A, 447, L21-L24, 200

VLT/UVES constraints on the carbon isotope ratio $^\mathsf{12}$C/$^\mathsf{13}$C at z = 1.15 toward the quasar HE 0515–4414