Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...395..969g&link_type=abstract
Astronomy and Astrophysics, v.395, p.969-974 (2002)
Astronomy and Astrophysics
Astrophysics
5
Ism: Clouds, Molecules
Scientific paper
We present an analysis of spectra of six stars taken with high resolution (R=220 000). The stars are reddened by molecular clouds that differ by the relative strength of the 5797 and 5780 diffuse interstellar bands (DIBs). The high signal-to-noise ratio of the spectra (S/N ~ 700-1000) shows that the abundance of the linear molecule C3 with respect to EB-V varies considerably from one star to an other. There is no correlation with EB-V. The strong variations in the abundance of C3 must therefore be caused by another circumstance. We point out that this may be the case: from an analysis of the interstellar potassium lines in the same spectra we conclude large differences in the state of ionization produced by interstellar photons with energies below the ionization potential of hydrogen. The ratio of the abundances of C3 and C2 varies considerably in different directions, even when the ratio between the strengths of various DIBs remains approximately constant. Based on data collected at the ESO 3.6 m telescope operated on La Silla Observatory, Chile.
Galazutdinov Gazinur
Krelowski Jacek
Lo Curto Gaspare
Moutou Claire
Musaev Faig
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