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We investigate the formation and the nature of the extended wings of the UV resonance lines of Si IV 1394, 1402A and C IV 1548 and 1550A in the spectrum of the LBV P Cyg. The effects of line blending in the neighbourhood of these lines were estimated by means of a grid of theoretical synthetic spectra, computed for the P Cyg model atmosphere. It is

We have compared the Tenerife data with the COBE Differential Microwave Radiometer (DMR) 2 year data in the declination +40° region of the sky observed by the Tenerife experiment. Using the Galactic plane signal at ˜30 GHz, we show that the two data sets are cross-calibrated to within 5%. The high Galactic latitude data were investigated for the

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We report on the discovery of 15 new weak-line T Tauri stars (wTTS) south of the Taurus molecular clouds based on the large database produced by the ROSAT All-Sky Survey. High-resolution spectroscopy of 109 optical counterparts of X-ray sources has been performed to measure their radial velocities in order to verify kinematic membership to the

The models for galaxy clustering in which galaxies are identified with peaks on the mass density field smoothed on an appropriate scale are plagued by some difficulties. We discuss them here, propose an alternative model that avoids them and compute the correlation functions implied by it. This model has been developed within the context of the