The 5780 diffuse band in peculiar interstellar clouds

Details The 5780 diffuse band in peculiar interstellar clouds The 5780 diffuse band in peculiar interstellar clouds

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260..391p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 391-396.

Astronomy and Astrophysics

Astrophysics

7

B Stars, Interstellar Matter, Molecular Clouds, O Stars, Peculiar Stars, Stellar Spectra, Dark Matter, Diffuse Radiation, Spectral Bands

Scientific paper

This paper presents the spectra of a sample of galactic stars in which the broad diffuse interstellar band at 5780 A is strongly attenuated in relation to their color excess and the neighhor feature at 5797 A is absent. The unusually large width of the 5780 band which is found in the direction of the Orion Trapezium stars is discussed in terms of intrinsic and Doppler broadening. The same clouds (apparently fragments of the Orion parent cloud) are known to produce peculiar extinction. It is suggested that the high density of collapsing clouds facilitates sticking of the diffuse band carriers to grain surfaces where they loose their identity reacting with the bulk of grain material. The process of sticking also alters the optical properties of grains.

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