The authors developed routines for intensity, equivalent width, and radial velocity measurements on CES plus Reticon spectra obtained with the ESO 1.4 m telescope. In order to achieve the optimal recovery of the signal, the noise has to be minimized by removing any parasitical effect. Special care has been devoted to the correction for remanence

The authors study the behaviour of a family of algorithms with different weight functions in an approach to algorithms working in real time. The behaviour of these algorithms is sorted by the sensitivity to noise photons. A "modified" gaussian function (a gaussian centered at the origin but whose peak is set to zero) presents good behaviour like

Near-infrared JHKL photometry of more than 200 stars in the open clusters Tr 14, Tr 15, Tr 16, Cr 228, and Cr 232 in the Carina Nebula is presented. By comparing these results with the available visual photometry and spectroscopy, it is found that the intracluster reddening is characterized, except in Tr 15, by a 'normal' extinction law for lambda

Details are given about the operation of a two station network and of a new semi-automatic station which has recently been added. Comparison is made with predicted duty cycles. A possible way of quantifying the sky quality is also given.

Not Available

Earth based multichannel photometry of integral sunlight has been obtained at Izaña (Tenerife) during 1984 - 1986. Power spectra of the solar luminosity variations of individual days show power in the 5 minute interval above noise at a level comparable to SMM data. When combining contigous days of data the signature of p mode solar oscillations