New measurements of the lithium abundance in a sample of 37 field dwarfs of low metallicity (-0.6 ≥ [Fe/H] ≥ 3.2) are presented. Combining these observations with those in the literature it is shown that extremely metal-deficient ("EMD") dwarfs ([Fe/H] ≤ -1.4) form a much more homogeneous population with regard to 7Li abundance than stars somewhat

Following the work started in 1984 to detect the solar intensity oscillations from ground (Jimenez et al., 1986), simultaneous velocity and intensity observations of 16 contiguous days of very high atmospheric quality obtained at Izana (Tenerife) have been analyzed. The frequencies of the p-mode intensity spectrum at three channels (500, 680 and

The RS CVn noneclipsing system II Peg has been observed in the J, H, K, L, and M infrared bands along a complete period. The shape of the light curve shows an unusual size and concentration of the dark spots in one of the hemispheres of the star. Photometric spectral type K3 IV is derived for the unperturbed photosphere and M4 for the dark spots

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