Diffuse band profiles in the Rho Ophiuchi cloud

Details Diffuse band profiles in the Rho Ophiuchi cloud Diffuse band profiles in the Rho Ophiuchi cloud

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443..698s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 443, no. 2, p. 698-704

Astronomy and Astrophysics

Astrophysics

5

Astronomical Models, Diffuse Radiation, Interstellar Matter, Line Shape, Molecular Spectra, Ophiuchi Clouds, Spectral Bands, Astronomical Observatories, Cavities, Computer Programs, Data Reduction, Grain Size, High Resolution, Impurities, Interstellar Extinction, Optical Polarization, Signal To Noise Ratios

Scientific paper

High-resolution, high signal-to-noise ratio line profiles are presented for the 5780 and 5797 A diffuse interstellar bands toward six stars in the Rho Oph dark cloud. Target stars were chosen to exhibit a wide range of interstellar grain properties, as measured by grain polarization and far-UV extinction. The extreme case of the heavily reddened star HD 147889 is included; this star has one of the highest known lambdamax values, indicative of unusually large grains. Despite the differences in the grain properties, the line profiles and central wavelengths for the 5780 A band were found to be essentially identical for all lines of sight. This finding is in contradiction to the results of the embedded cavity grain model for diffuse bands, which predicts changes in both profile and central wavelength with grain size and impurity concentration. Results therefore support a molecular origin for the diffuse bands.

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