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We have analyzed high resolution spectra of several slightly to moderately reddened stars collected at two observatories: ESO (La Silla) and Terskol (Northern Caucasia), to estimate the abundance of the C 5 molecule in the interstellar medium. We confirm the presence of a feature near 4975 A which appears to be a weak DIB rather than the predicted C 5 band since the origin band near 5109 A remains invisible even in spectra of high signal–to–noise ratio (~2500) and spectral resolution ($R\sim 220\,000$). This confirms that the C 5 abundance in translucent interstellar clouds is very low. We estimate its limit as low as 10 11  cm -2 in the scale $E(B-V)=0.35$ for “zeta" type objects that is two times lower than that of Maier et al. (2002).

An upper limit to the interstellar $\vec{C_5}$ abundance in translucent clouds