Bibcode
Chlewicki, G.; de Groot, M. S.; van der Zwet, G. P.; Greenberg, J. M.; Alvarez, P. P.; Mampaso, A.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 1, Feb. 1987, p. 131-136.
Advertised on:
2
1987
Citations
41
Refereed citations
34
Description
Spectra of early-type stars in several heavily reddened OB associations
are used to study broad diffuse bands in the range from 5700 to 6300
angstroms. The features at 5778 angstroms and 6170 angstroms correlated
well with narrower lines in their vicinity. The 5795-angstrom band is
not correlated with the overlapping line at 5797 angstroms but appears
to be part of a structure which includes 5780- and 5778-angstrom
features. The profile of the band at 6170 angstroms is smooth and
featureless; the shape of the 5778-angstrom band is more complex with
three well-defined peaks. The explanation for the observed correlation
patterns can be found more easily within molecular theories of the
origin of bands. It is shown that vibronic interactions in individual
molecules or a superposition of narrower lines from slightly modified
but closely related species can give rise to broad bands, such as 6170
and 5778 angstroms.