An upper limit to the interstellar C5 abundance in translucent clouds

Details An upper limit to the interstellar C5 abundance in translucent clouds An upper limit to the interstellar C5 abundance in translucent clouds

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...395..223g&link_type=abstract

Astronomy and Astrophysics, v.395, p.223-226 (2002)

Astronomy and Astrophysics

Astrophysics

2

Ism: Clouds, Molecules

Scientific paper

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 C5 molecule in the interstellar medium. We confirm the presence of a feature near 4975 Å which appears to be a weak DIB rather than the predicted C5 band since the origin band near 5109 Å remains invisible even in spectra of high signal-to-noise ratio ( ~ 2500) and spectral resolution (R ~ 220 000). This confirms that the C5 abundance in translucent interstellar clouds is very low. We estimate its limit as low as 1011 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). Based on data collected at the ESO 3.6 m telescope operated on La Silla Observatory, Chile and 2-m telescope of the Terskol Observatory, Russia.

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