The high-frequency spectrum above the acoustic cutoff frequency (νac) of the solar atmosphere has been observed in velocity measurements at low and high angular degrees and reveals significant evidence for the presence of pseudomodes characterized by their equally spaced signal. In this paper we study this region of the spectra using for the first

The first table (dataset1) contains 1590 data points collected with 1.5m telescopes equipped with conventional photometers at the observatories of San Pedro Martir, (OAN, Mexico) and Sierra Nevada, (OSN, Spain) at the following epochs: February 4-17 2002, January 8-14 2003 and March 17-19 2004 (Data Set 1). The data consist of differential

Eleven models of Galactic chemical evolution, differing in the carbon, nitrogen, and oxygen yields adopted, have been computed to reproduce the Galactic O/H values obtained from H II regions. All the models fit the oxygen gradient, but only two models also fit the carbon gradient, those based on carbon yields that increase with metallicity owing to

BS Ind (=HD 202947) is a young K0V star in the Tucana association. Photometric observations with the Hipparcos satellite show an eclipse-like light-curve with primary and secondary eclipse. The eclipsing binary has a period of 0.435338 days and a circular orbit. Our spectroscopic observations however show that the K0V primary is a single-line

We present integral field spectroscopy of NGC 5033, a low luminosity Seyfert galaxy. The observations were made with INTEGRAL, a fiber based system operating at the WHT. The intensity map of the Hβ emission line represents a spiral or ring-like pattern of HII regions. On the contrary, the [OIII] intensity map morphology is markedly anisotropic. The

Empleando las bases de datos en el infrarrojo cercano más completas de las que se dispone hoy en dia, como son 2MASS, DENIS y TCS-CAIN (cartografiado privado del IAC desarrollado íntegramente mediante observaciones obtenidas en el Telescopio Carlos Sánchez) se ha analizado la distribución estelar del disco de nuestra Galaxia. Para ello se ha