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Six occultations of stars by the coma of comets 78P/Gehrels 2, 69P/Taylor, and 81P/Wild 2 have been observed using the 82cm IAC-80 telescope at Teide Observatory (Canary Island, Spain). Time series CCD images using R broadband filter were done. No star brightness extinction was detected even for the closest approach (400 Km from the nucleus). A

The Tenerife beam-switching radiometers have now surveyed an area of one steradian with a resolution of 5 deg to 15 deg. Observations with scaled antennas are made at 10, 15 and 33 GHz to distinguish intrinsic CMB and Galactic fluctuations. The 15 and 33 GHz sensitivity is 20 muK (deltaT/T = 7x10 exp-6) per beam area. These data are supplemented by

We review general observational properties of bars in galaxies, and relations between bars, their dynamics, and (circum)nuclear activity. We consider new measurements of bar fractions and of the distribution of bars with host type, bar strength, and bar pattern speeds. Bars redistribute material radially, leading to flattened abundance gradients

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We have performed a detailed oxygen abundance analysis of 23 metal-poor (-3.0 [Fe/H] -0.3) unevolved halo stars and one giant through the OH bands in the near UV, using high-resolution echelle spectra. Oxygen is found to be overabundant with respect to iron in these stars, with the [O/Fe] ratio increasing from 0.6 to 1 between [Fe/H] = -1.5 and