Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...712l.165d&link_type=abstract
The Astrophysical Journal Letters, Volume 712, Issue 2, pp. L165-L168 (2010).
Astronomy and Astrophysics
Astronomy
2
Infrared: Ism, Ism: Lines And Bands, Ism: Molecules, Stars: Individual: Hd 183143
Scientific paper
A number of vibronic progressions based on low-energy vibrational modes of a large molecule have been found in the diffuse interstellar band (DIB) spectrum of HD 183143. Four active vibrational modes have been identified with energies at 5.18 cm-1, 21.41 cm-1, 31.55 cm-1, and 34.02 cm-1. The mode at 34.02 cm-1 was previously recognized by Herbig. Four bands are associated with this molecule, with origins at 6862.61 Å, 6843.64 Å, 6203.14 Å, and 5545.11 Å (14589.1 cm-1, 14608.08 cm-1, 16116.41 cm-1, and 18028.9 cm-1, respectively). The progressions are harmonic and combination bands are observed involving all modes. The appearance of harmonic, rather than anharmonic, terms in these vibronic progressions is consistent with torsional motion of pendant rings, suggesting that the carrier is a "floppy" molecule. Some constraints on the type and size of the molecule producing these bands are discussed.
Duley Walter W.
Kuzmin Stanislav
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