Journal Article

A search for naphthalene in diffuse interstellar clouds

Susana Iglesias-Groth, Jonay González Hernández and A. Manchado

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 4, pages 2785-2792
Published in print March 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19846.x
A search for naphthalene in diffuse interstellar clouds

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We have obtained high-resolution optical spectroscopy of 10 reddened O-type stars with Ultraviolet and Visual Echelle Spectrograph at Very Large Telescope to search for interstellar bands of the naphthalene cation (C10H8+) in the intervening clouds. No absorption features were detected near the laboratory strongest band of this cation at 6707 Å except for star HD 125241 (O9 I). Additional bands in the optical spectrum of this star appear to be consistent with other transitions of this cation. Under the assumption that the bands are caused by naphthalene cations, we derive a column density = (1.2 ± 0.3) × 10 13 cm−2 similar to the column density claimed in the Perseus complex star Cernis 52. The strength ratio of the two prominent diffuse interstellar bands at 5780 and 5797 Å suggests the presence of a σ-type cloud in the line of sight of HD 125241.

Keywords: ISM: abundances; ISM: lines and bands; ISM: molecules

Journal Article.  4187 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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