Observations of Diffuse Interstellar Bands Attributed to C-7

Details Observations of Diffuse Interstellar Bands Attributed to C-7 Observations of Diffuse Interstellar Bands Attributed to C-7

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...531..329m&link_type=abstract

The Astrophysical Journal, Volume 531, Issue 1, pp. 329-335.

Astronomy and Astrophysics

Astronomy

19

Ism: Molecules, Line: Identification, Methods: Laboratory, Molecular Data

Scientific paper

Recent advances in laboratory gas-phase spectroscopy of large molecules and their ions permit a direct comparison between the diffuse interstellar bands (DIBs) and proposed carriers. On the basis of gas-phase data, Tulej et al. recently suggested that five A2Πu<--X2Πg electronic transitions of the linear carbon-chain anion C-7 match with DIBs. We have obtained high-resolution visible spectra of four reddened stars (HD 46711, HD 50064, HD 183143, and Cyg OB2 12) to make a detailed comparison with the C-7 laboratory data. Our data show that three of the C-7 bands (000 at 6270.2 Å, 310 at 6064.0 Å, and 120310 at 4963.0 Å) are in good agreement with DIBs in wavelength and relative intensity. A fourth band (110 at 5612.8 Å) also agrees in intensity but is apparently off by 2 Å in wavelength. All other laboratory bands of C-7 are not expected to be detectable in astronomical spectra with the current level of sensitivity. The gas-phase spectrum of C-7 agrees with the DIBs better than that of any previously proposed molecule. However, the question of whether C-7 is a DIB carrier cannot be definitively answered until (1) better laboratory measurements confirm, refute, or explain the wavelength discrepancy for the 110 band and/or (2) better astronomical spectra reveal the presence or absence of other C-7 bands. Based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium.

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