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The 5780 diffuse band in peculiar interstellar clouds
This paper presents the spectra of a sample of galactic stars in whichthe broad diffuse interstellar band at 5780 A is strongly attenuated inrelation to their color excess and the neighhor feature at 5797 A isabsent. The unusually large width of the 5780 band which is found in thedirection of the Orion Trapezium stars is discussed in terms ofintrinsic and Doppler broadening. The same clouds (apparently fragmentsof the Orion parent cloud) are known to produce peculiar extinction. Itis suggested that the high density of collapsing clouds facilitatessticking of the diffuse band carriers to grain surfaces where they loosetheir identity reacting with the bulk of grain material. The process ofsticking also alters the optical properties of grains.
| The delta Scuti variability of the high metallicity delta Del star, rho Pavonis
Abstract image available at:http://adsabs.harvard.edu/abs/1981MNRAS.194..737K
| HD 196517: A New Delta Scuti Star
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