RESUMEN. Presentamos observaciones de la estrella HD 213534 (GX Peg) efectuadas dentro de una campafia para determinar los limites de detecciotn e tierra de oscilaciones de alta frecuencia y pequena amplitud. ABSTRACT. Observations of the star HD 213534 (GX Peg) made to determine the detection limits for high frequency and small amplitude star

. Medjante fotometria fotoelectrica BV fueron estudiados 31 EUPHROSYNE, 118 PEITHO en su oposici6n de 1988, y 13 EGERIA, 196 PHILOMENA y 471 PAPAGENA en su oposici6n de 1989, con el fin de determinar su per1odo de rotaci6n, la orientaci6n del polo y la forma de los asteroides. Se presentan las curvas de luz de 118 PEITHO y 13 EGERIA. ABSTRACT. The

The authors obtained near infrared images in J, H, and K filters of the H II region N159 in the LMC with the IR Imager on the 1.5 m telescope of CTIO. Some 50 sources are detected in an area of roughly 10 arc min squared. The region seems to be a site of active star formation associated to a large molecular complex and possibly coincides with one

An experiment aimed at diffraction-limited imaging of astronomical sources in the 2-5-micron range is presented. It is based on a rotation shearing interferometer that produces fringes in the pupil plane that can be scanned through the zero optical path difference. The two-dimensional interferograms are recorded with an infrared camera looking at

From published catalogs, basic physical properties including diameters, masses, and neutral hydrogen contents of spiral galaxies have been studied as a function of the arm class. The results indicate that galaxies with well-defined arms have longer scale-lengths (a difference comparable in the red to that in the blue) and are more massive (in both

ABSTRACT: B, V, R, and I CCD frames were obtained for the Southern Galaxies NGC 5757, and IC 1091. The frames were analysed to derive standard photometric and geometric parameters such as integrated magnitudes and colors, dimensions and inclination. Radial luminosity profiles along several directions were calculated and combined to give one mean