The authors have studied the IRAS extragalactic catalogue (Lonsdale et al., 1985), with the aim of reliably identifying quasi-stellar objects. Using the best available data in the literature on the positions and continuous spectra of QSO's, it is concluded that, of the over sixty associations tentatively suggested in the catalogue itself, on

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The paper presents low resolution spectra in the range of 3700 to 7100 A, taken with the Royal Greenwich Observatory Image Photon Counting System on the 2.5-meter Isaac Newton Telescope, at the Observatory of El Roque de los Muchachos on the night of September 25/26, 1985. At this epoch, the Comet had a heliocentric distance of 2.41 AU. The paper

For circumstellar systems with an orientation perpendicular to the plane of the sky, and under some simplifying assumptions, the surface brightness integral equation can be formally inverted. Application of the resulting equation to the disk of dust surrounding the star β Pictoris seems to reveal a radial distribution of dust going approximately

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