We have observed six highly metal-deficient dwarfs in the spectral range containing the resonance doublet of 9Be II at 3130 Å. Using the method of spectral synthesis we have evaluated the abundance of 9Be in these objects. In three of the stars, those with metallicities [Fe/H] -1.5 we set upper limits to the 9Be abundance, 9Be/H, below 2.5 10-12

The authors have combined an enhanced Earth-based occultation data set and Voyager occultation observations to determine a new solution for the ring orbital elements and the direction of the planetary pole. They describe the new ground-based observations and the Voyager data used for this analysis. They discuss the new orbit solution and a search

H-alpha observations of AG Peg, obtained using an IPCS detector on the 2.5-m Isaac Newton Telescope of the Observatorio del Roque de Los Muchachos on November 13-14, 1986, are reported. A mask reducing the effective entrance aperture to 55 cm and a neutral filter limiting the photon flux to 14 photons/frame were employed in 15-msec/frame exposures

The permitted broad component of the H-beta emission line in the broad-line radio galaxy (BLRG) 3C 390.3 presents a double-peaked structure similar to that seen in cataclysmic variables. The profile of the line is well fitted by a relativistic accretion disk with an intermediate inclination to the line-of-sight.

The authors present long slit low dispersion flux calibrated spectra for the planetary nebula A 78, and from these they obtain the chemical abundances and their variation within the nebula. In the central part of the nebula almost no hydrogen is found implying that the envelope of the central star is burning helium. The authors also measured an

High-resolution VLA radio mapping at 1.46, 4.84, and 15.0 GHz is presented together with NIR J,H,K,L, and M mapping and photometry of a broad range of type I postmain-sequence nebulae. Many of these sources have extremely compact infrared and radio cores ranging from 0.1 to 0.01 pc in size; in some cases they contain up to 96 percent of the total