Two EXOSAT observations of gamma-ray burst error boxes and their possibly associated optical transients are discussed. No point source was detected in either box. A comparison with Einstein data (Pizzichini et al., 1986) is made for one of them (November 19, 1978). The data are interpreted in the framework of neutron star models for gamma-ray

Spectroscopic and photometric observations are used to determine the distributions of gas and the kinematics in the central zones of a number of spirals. In addition to a ring structure in the gas, there is often found a measurable expansion with high radial velocity near the nucleus. A significant correlation is noted between the absence of

Selecting stars with previously measured or estimated rotational periods we have measured equivalent widths of the Li doublet (6708 A) in 8 stars of the Hyades late main sequence and, combining our data with literature values, derive a homogeneous set of Li abundances. The graph of Li against period is monotonic, taking, not surprisingly, a similar

The asymmetry in the Stokes V profile observed in solar faculae can be explained by assuming that the magnetic field increases with height while downflow speed decreases. The MHD compatibility of such solution is briefly discussed together with an observational test for that possibility.

The authors used simple kinematic, dynamic and geometrical assumptions to infer the orbital parameters of M32 and NGC 205 about M31. They find that both galaxies rotate in a retrograde sense compared to M31 indicating a possible common origin independent of the mother galaxy. Their periods, each ≅108yr, and their orbital radii, ≅12 kpc, are

The authors present an improved iterative method for deriving temperature corrections in stellar atmospheres. At each step of iteration, the procedure computes, from the current values of the radiation field, a set of depth-dependent factors, averaged over angles and frequencies. Even a crude initial estimate of the radiation field leads to a