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IAUC 4306 available at Central Bureau for Astronomical Telegrams.

Improved non-LTE line formation calculations for hydrogen in O-stars are presented. The calculations are carried out by means of the method recently developed by Werner and Husfeld (1985) and use an extensive hydrogen model atom with 10 non-LTE levels and 55 transitions. For most of the transitions Stark-broadening is included in the statistical

Ground-based multichannel photometry of integral sunlight has been obtained at Izaña (Tenerife) during three months in 1984 with a photometer built at ESTEC. Power spectra of solar irradiance variations of individual days show power in the 5 min band just above noise at a level comparable to the one found from the SMM data (Woodard and Hudson, 1983

The published J, H, and K band photometry of Frogel et al. (1983) for a sample of over 350 red giants in 33 galactic globular clusters, which covers the complete range of metallicities found in globular clusters, is used to derive a set of empirical relations which allow to predict the intrinsic colors of Population II giants as a function of

Preliminary results of a search for the variation of the solar granulation properties with the heliographic latitude are presented. Within errors, no changes are found in the power spectra and sizes between N-S and E-W scans.