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Absorption oscillator strengths have been determined from high-resolutionspectra in the 967-972 \AA region of three CO isotopomers for transitions tothe Rydberg levels 4{\it p$\pi$}(0), 3{\it d$\pi$}(1) and 4{\it p$\sigma$}(0),as well as to the mixed {\it E(6)} level recently characterized by Eidelsberget al. (2004). Synchrotron radiation from the Super-ACO electron storage ringat Orsay (LURE) was used as a light source. Oscillator strengths were extractedfrom the recorded spectra by least-squares fitting of the experimental profileswith synthetic spectra taking into account the homogeneous and heterogeneousinteractions of the four levels. Column densities were derived from fits to the3{\it p$\pi$}(0) absorption band whose oscillator strength is well established.These are the first reported measurements for $^{13}$C$^{18}$O. For$^{12}$C$^{16}$O, our results are consistent with the larger values obtained inthe most recent laboratory and astronomical studies.Comment: 9 pages 7 figures 3 tables. Accepted in A&A, date of acceptance  11/05/200

astronomy and astrophysics

Oscillator strengths for transitions to Rydberg levels in $\mathsf{^{12}}$C$\mathsf{^{16}}$O, $\mathsf{^{13}}$C$\mathsf{^{16}}$O and $\mathsf{^{13}}$C$\mathsf{^{18}}$O between 967 and 972 Å