PG 1351+64 is a bright radio quiet quasar (z = 0.088, mV ≅ 14). IUE observations obtained within few months in 1982 - 1983 showed variations in the 1200 - 2000 Å band up to a factor of 2. Since then the object has been monitored regularly. The observations of 1984 - 1986, including also archival data, have more than doubled the number of available

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IAUC 4257 available at Central Bureau for Astronomical Telegrams. IAUC 4257 available at Central Bureau for Astronomical Telegrams.

The nonlinear development of the kink instability in a horizontal magnetic flux tube with a field strength exceeding the equipartition value lying initially in the deep convective zone is calculated. A Lagrangian numerical code is developed to obtain solutions for the system of equations dictating the evolution of a thin magnetic flux tube in a

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Using the Coudé Echelle Spectrograph fed by the 1.4 m Coudé Auxiliary Telescope at ESO, La Silla, the authors have obtained a sequence of fourteen high resolution (λ/Δλ = 105) spectra at high signal to noise ratio, of main sequence and near main sequence objects in the wavelength range containing the 6708 Å resonance doublet of lithium. Using