Time resolved spectra of SS Cyg corresponding to different outburst types are analyzed. Some evidence has been found for an increase of the mass transfer rate from the secondary star as the mechanism responsible for symmetric outburst. Heating of the secondary star has been found during the rise to an asymmetric outburst which appears to be

The authors present high signal-to-noise ratio spectrophotometry obtained in the optical and near-infrared with the double spectrograph ISIS on the WHT, of the M33 giant H II region NGC 604. The authors' main aim was to deduce global properties of a nearby giant H II region. The near-infrared spectral range, central to the authors' study, comprises

QUIZA LA FORMA MAS DIRECTA DE MEDIR LA IMPORTANCIA DE LA HELIOSISMOLOGIA COMO HERRAMIENTA PARA ESTUDIAR EL INTERIOR SOLAR SEA EL DAR CUENTA DEL INMENSO ESFUERZO OBSERVACIONAL REALIZADO EN LOS ULTIMOS AÑOS. LOS EXPERIMENTOS A BORDO DE SOHO, LA RED GONG Y LOS DATOS DEL ESPECTRO-FOTOMETRO MARK I, ENTRE OTROS, SE ESPERA SUMINISTREN DATOS DE ALTISIMA

Since the discovery of very low-Ti (VLT) basalts as tiny clasts and glasses in Apollo 17 drill cores, VLT basalts have been recognized as an important lunar rock type. Lunar sample 78526 (8.77 g), our largest specimen of VLT basaltic composition, is an impact melt composed of vitrophyric green glass with minor lithic and mineral inclusions. Major

Howardites contain dark, carbonaceous chondrite clasts making up a few percent of these meteoritic breccias. This work utilizes a micro-coring technique to extract 1-20 microgram-sized samples of these clasts from thin sections, and micro-INAA techniques to obtain trace element concentrations. The hope was that the trace element geochemical details

We obtain the Na I lambda 8183,8195 absorption line radial velocity curves for the polars ST LMi and MR Ser, from which we find the semi-amplitudes to be Kabs=329 +/- 9 km/s and Kabs=289 =/- 9 km/s respectively. We find that for both systems the effects on the Na I absorption lines due to X-rays heating the inner face of the secondary are