The publication by Lloyd (1984) of new and revised data for a sample of active nuclei brought the number of published observations of 3C 345 up to over 900, between 1965 and 1980. Since the last major study, by Barbieri et al. (1977), sufficient new data has been produced to merit a complet revision of previous analysis. A compilation of the

The observation of a solar absorption line by means of resonant scattering over several months in the study of solar oscillations, yields data which may be analyzed to provide details of the line shape over the region being studied. The asymmetry and nonlinearity of the K 769.9 nm line are found and the effect on the overall response of the

One of the major problems using quasars to investigate the Hubble diagram is an uncertainty as to the size of the bolometric correction. Some estimates have suggested that it may be as high as 6 magnitudes. To this end, the authors have compiled data from a wide range of sources, to investigate the behaviour of quasar spectra over the range from

The development of astrophysical observatories in the Canary Islands by the European community is discussed. Consideration is given to principal astronomical expeditions to the Canary Islands; site testing programs in the Islands; and the agreement established between Spain and the other European countries on the use of the facilities. The

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A a part of a general chromospheric modelling programme on late-type dwarfs, the authors searched for the spectroscopic variability in chromospheric lines associated with activity. They considered especially the α Centauri system, a very close binary system composed of a G2 V and K1 V dwarfs in order to compare them to the sun. The authors searched