An analysis based on a comparison between observations and stellar models has been carried out to identify radial modes of oscillations in several multi-periodic delta Scuti stars of the Praesepe cluster (BU, BN, BW and BS Cnc). The assumption that all the stars considered have common parameters, such as metallicity, distance or age, is imposed as

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We discuss observations and seismic analyses for three multi-periodic delta Scuti stars in the Praesepe cluster: BU, BN and BV Cnc. For two stars (BU and BN Cnc) we re-analyse published photoelectric photometry and show that using statistical weights results in a dramatic reduction in the noise level. We detect seven frequencies in BU Cnc and eight

Results from a photometric search for extrasolar planetary transits across the eclipsing binary CM Dra are presented. The TEP (Transits of Extrasolar Planets) network has observed this star since 1994, and a lightcurve with 617 hours of coverage has been obtained. The data give a complete phase coverage of the CM Dra system at each of the 3 years

En este trabajo se analiza la emisiónde (Fe II) y (Fe III) en siete regiones H II galaácticas: M42, M43, M8, M16, M17, M20 y NGC 7635, usando para ello espectros en el rango landa landa 4200-8800 obtenidos en distintas zonas de cada objeto. Las líneas de emisión no pertenecientes a los iones del Fe se usan para determinar las condiciones físicas y

We present TAURUS Fabry-Perot velocity data in Hα emission of the disc of the grand design spiral M 100 (NGC 4321). We have studied the emission spectra of the 200 H ii regions most luminous in Hα, calibrated in luminosity using photometric Hα imaging from the literature. The emission spectra of individual H ii regions were fitted using one or more