SE PRESENTA UN ESTUDIO OBSERVACIONAL DE PROCESOS DE FORMACION ESTELAR EN GRAN ESCALA EN GALAXIAS ESPIRALES CON BRAZOS BIEN DEFINIDOS. SE HA OBSERVADO NOC 4321 EN 21 CM HI, J=1 0 CO Y H Y USADO DATOS DE LA LITERATURA PARA M51. DE UN ANALISIS DE LA EFICIENCIA DE FORMACION DE ESTRELLAS MASIVAS (MSFE) SIGUIENDO LOS BRAZOS PRINCIPALES DE ESTAS GALAXIAS

On the basis of a sample of Virgo cluster galaxies in a larger set of heterogeneous literature data, it is shown that ellipticals, early-type dwarfs, and bulges of S0s and of spirals form two distinct families in the plane of the effective parameters, R(e) and mu(e). The 'ordinary' family is composed of all galaxies fainter than MB of about -19.3

We present a second-order analytical expansion of null equatorial geodesics in the Kerr metric. The equations developed are applied to the study of light transit in compact binary systems. We show that the effects arising from path bending have a significant influence on the computed time delays, even at first order of approximation in the

An analysis of about 27 h of fast photometry of the cool ZZ Ceti white dwarf PG2303+243 reveals (1) the presence of many modes (as many as 22), some of them of low enough amplitude to have escaped previous detection, and (2) a short time scale (less than 10 d) drastic variation in amplitude. A preliminary identification of the modes observed in

IAUC 5634 available at Central Bureau for Astronomical Telegrams. IAUC 5634 available at Central Bureau for Astronomical Telegrams.

Consideration is given to the suppression of the radial and polar escape of magnetic flux in the form of toroidal flux tubes (flux rings) from low latitudes in the overshoot region below the solar convection zone through the combined action of the subadiabatic ambient stratification and the rotationally induced forces. It is shown that a flux ring