Diffuse Absorption Bands in the Spectra of Mass Losing Objects

Details Diffuse Absorption Bands in the Spectra of Mass Losing Objects Diffuse Absorption Bands in the Spectra of Mass Losing Objects

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..909l&link_type=abstract

Astronomy and Astrophysics, Vol. 274, NO. 3/JUL(III), P. 909, 1993

Astronomy and Astrophysics

Astrophysics

20

Stars: Circumstellar Matter, Stars: Mass-Loss, Interstellar Medium: Dust, Extinction

Scientific paper

Observations of diffuse absorption bands in the spectra of a variety of sources known to be surrounded by circumstellar matter are reported. The sources have been selected from various manifestations of their enrichment in C, N and O. In sources with unidentified infrared bands, we do not find evidence of diffuse bands. We find evidence of diffuse bands in carbon-rich and oxygen-rich sources indicating that the carriers might be produced in both kind of circumstellar shells. We conclude that the classical dichotomy C-rich/ O-rich is not adequate for finding the origin of diffuse bands. In a variety of sources with O-rich or N-rich environments, in particular in luminous blue variables or objects photospherically similar, we find diffuse bands. We suggest that nitrogen may be an important constituent of the carriers or alternatively that it plays a role in their formation. The 6177 Å diffuse band is shown to have a red wing extending from 6200 to 6220 Å. This band and especially its red wing appear enhanced in mass-losing objects.
In an appendix, we draw the attention to a possible spectroscopic similarity between some post-AGB stars and LBVs.

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