The Gas Phase Spectrum of Cyclic C18 and the Diffuse Interstellar Bands

Details The Gas Phase Spectrum of Cyclic C18 and the Diffuse Interstellar Bands The Gas Phase Spectrum of Cyclic C18 and the Diffuse Interstellar Bands

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...640..369m&link_type=abstract

The Astrophysical Journal, Volume 640, Issue 1, pp. 369-372.

Astronomy and Astrophysics

Astronomy

10

Ism: General, Ism: Lines And Bands, Ism: Molecules, Stars: Individual (Ζ Oph), Stars: Individual: Henry Draper Number: Hd 204827

Scientific paper

The gas phase spectrum of the cyclic C18 molecule recorded in the laboratory at a temperature typical of diffuse interstellar clouds is compared with absorption features toward ζ Oph and HD 204827 in the 5730-5934 Å region. For the origin band at 5928.5 Å an upper limit to the column density of <=1.8×1011 cm-2 is inferred. The origin band pattern in the laboratory spectrum changes on lowering the internal temperature in the 100-20 K range and bears a striking resemblance to the observed structure of a number of DIBs at other wavelengths. This suggests that platelike molecules or ions, comprising a couple of dozen to hundred carbon atoms, could be responsible for some of the latter absorptions.

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