We have computed limb-darkening coefficients for five commonly used near infrared photometric bands, namely R, I, J, H, and K, using the stellar atmosphere models by Kurucz (1993). Since the behaviour of the specific intensities is very dependent on the range of effective temperatures considered, we have adopted three analytical approximations to

High resolution spectroscopic observations have been obtained for the ring nebulae around the galactic Wolf-Rayet stars WR 113 (CV Ser), WR 116, WR 128 (MR 95), WR 133, WR 134 (MR 100) and WR 153 using an echelle spectrograph. Gaussian fit analysis of the emission lines has been performed to establish the dynamical classification of the objects as

The GOLF experiment on the SOHO mission aims to study the internal structure of the sun by measuring the spectrum of global oscillations in the frequency range 10-7 to 10-2 Hz. Bothp andg mode oscillations will be investigated, with the emphasis on the low order long period waves which penetrate the solar core. The instrument employs an extension

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We compare the details of the distributions of HI, Hα , and far-UV emission in the spiral arms of M81, at a resolution of about 9'' (linear resolution 150 pc at 3.7 Mpc distance). The effects of extinction on the morphology of the Hα and far-UV are shown to be essentially bi-modal, i.e. the extinction is either very small or very large. The

Results of coordinated observations of the flare star EV Lac in September 1992 are presented. Among 25 flares detected during 28 hours on patrol in Crimea four had large enough amplitudes to permit the quantitative analysis of their radiation by colour-colour diagrams. Calculation of V-I colour index for different radiation sources enable us to