Line profiles of the diffuse interstellar lines at 5780 A, 5797 A

Details Line profiles of the diffuse interstellar lines at 5780 A, 5797 A Line profiles of the diffuse interstellar lines at 5780 A, 5797 A

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.174..571d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 174, Mar. 1976, p. 571-586.

Astronomy and Astrophysics

Astronomy

50

Diffuse Radiation, Electron Transitions, Interstellar Radiation, Line Shape, Line Spectra, Molecular Spectra, Astronomical Spectroscopy, Molecular Excitation, Photodissociation, Ultraviolet Radiation

Scientific paper

Photoelectric coude scanner observations of the interstellar diffuse lines at 5780 and 5797 A are reported. With a resolution of about 0.2 A, line-profile differences are seen in the sample of eight stars. In part, these are attributed to the overlapping contributions from several clouds in the line of sight. Intrinsic profile differences are also suggested. The hypothesis that some of the diffuse lines represent electronic transitions in large molecules is examined. Synthetic spectra are shown which approximate the observed profiles. Excitation of these hypothetical molecules is examined. Their stability against photodissociation by the interstellar ultraviolet-radiation field is noted as a key problem for future study.

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