A light curve of the eclipsing binary CM Draconis has been analyzed for the presence of transits of planets of size >=2.5 Earth radii (RE), with periods of 60 days or less, and in coplanar orbits around the binary system. About 400 million model light curves, representing transits from planets with periods ranging from 7 to 60 days, have been

We compute photoionization models for the giant extragalactic H II region NGC 2363, and compare them with optical observational data. We show that models computed with the observed metallicity of the cluster (Z=0.10 Zodot) do not reproduce the observed features of the spectrum, and that the disagreement can be overcome by allowing for spatial

When the Reynolds number is not small, the wake trailing a buoyant magnetic flux tube sheds vortex rolls therefore producing a Von Karman vortex street and an imbalance of vorticity in the tube which results in a transverse oscillation of the tube as a whole. The actual path followed by the magnetic structure is therefore directly affected by the

The High Altitude Observatory of the National Center for Atmospheric Research (HAO/NCAR) in collaboration with the Instituto de Astrofísica de Canarias (IAC) have recently completed a two-station helioseismic network with sites at Mauna Loa, Hawaii and Izana, Tenerife. The instruments are Doppler imagers employing Magneto-Optical filters and are

Ring diagram analysis, a technique of local helioseismology, has been applied to 120 regions of 15deg×15deg over the solar surface in order to study the mass motions in the upper layers of the convection zone. The horizontal flows from ~0.95 Rsolar up to the surface have been investigated in a region spanning 360deg in longitude and about 75deg in

Available from the Minor Planet Center.