The simulated annealing algorithm for phase retrieval has been applied in image reconstruction from low-light level stellar speckle interferometry (SSI) data. A realistic computer simulation of photon-limited SSI has been performed, successfully obtaining a reconstructed image. The algorithm has been shown to be robust and able to give good

The isolated pair of interacting ellipticals NGC 2672/2673 (Arp 167; Karachentsev 175), whose line-of-sight relative velocity is about 520 km/s, is studied. This very unequal mass system features two low surface brightness plumes emerging from the secondary galaxy NGC 2673. Photometric data on the pair are described, and the distortions in the

Three nights of broadband filter monitoring of the OX 169 variable X-ray quasar using a GEC-type CCD have yielded a 0.005 mag rms precision in the R band. Rapid variation is noted in both B and R on 10-15 min (and greater) time scales; these are, however, of considerably lower amplitude than the observed X-ray variability reported by Tananbaum et

ESTE TRABAJO ESTA BASADO EN OBSERVACIONES, MEDIANTE DETECTORES CCD, DE LAS CONTRAPARTIDAS OPTICAS DE UNA MUESTRA COMPLETA DE RADIOGALAXIAS DE BAJA LUMINOSIDAD QUE CONTIENEN JETS BIEN DEFINIDOS. PARA EL ANALISIS FOTOMETRICO Y MORFOLOGICO DE LAS GALAXIAS SE HA DESARROLLADO UN METODO PARA MODELAR Y SUBSTRAER LA DISTRIBUCION DE LUZ ESTELAR DE LAS

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The author reports on a study of the x-ray spectral variability of 37 low-mass x-ray binaries (LMXRB). The sample studied consists of all LMXRB which were detected with the EINSTEIN Monitor Proportional Counter at greater than 10 c s-1. The spectral variability has been studied through the use of Hardness-Intensity Diagrams (HID). The brighter