Even the most sensitive cosmic microwave background anisotropy experiments have signal-to-noise ratios

We present the first observational evidence for a collimated jet in a short-period cataclysmic variable system: the recurrent nova T Pyxidis. Optical spectra show bipolar components of H alpha with velocities ~1400 km s-1, very similar to those observed in the supersoft X-ray sources and in SS 433. We argue that a key ingredient of the formation of

In this paper we report CCD photometry in broad band B, R, and I colors, as well as in the Hα, for a sample of eight HII galaxies with strong radio emission. In addition, we present new radio continuum observations in the frequency range between 8 and 15GHz. For seven of these galaxies, previous radio continuum observations have been reported by

The Iris network for helioseismology has operated since 1989. We present tables of solar p-mode frequencies for observations taken during the four summer seasons from 1989 to 1992. This analysis uses the technique of maximum likelihood fitting and a χ_2_^2^ model for the probability density function of the spectrum. The simultaneous fitting of odd

EN ESTA TESIS PRESENTAMOS LA BUSQUEDA, DETECCION Y CARACTERIZACION DE LAS ENANAS MARRONES EN EL CUMULO ABIERTO JOVEN DE LAS PLEYADES. PARA ELLO HEMOS REALIZADO DOS EXPLORACIONES FOTOMETRICAS CCD EN LOS FILTROS RI E IZ QUE HAN CUBIERTO 0.16 GRADOS 2 Y 1 GRADO 2 EN EL CENTRO DEL CUMULO, Y ALCANZADO MAGNITUDES LIMITE I= 21.0 Y 22.2, RESPECTIVAMENTE

A survey of interstellar Na I D1 and D2 absorption features found in the spectra of 31 early-type stars in the first and fourth Galactic quadrants reveals a new picture of the large-scale kinematics of interstellar gas in the vicinity of the Sun. While absorption features found in the spectra of stars in the fourth Galactic quadrant show the gas