ISOPHOT covers the largest wavelength range on ISO from 2.5 to 240μm. Its scientific capabilities include multi-filter and multi-aperture photometry, polarimetry, imaging and spectrophotometry. All modes can optionally include a focal plane chopper. The backbone of the photometric calibration are internal standard sources checked against celestial

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EN LA PRIMERA PARTE DE ESTA TESIS SE PRESENTA UNA CATALOGACION Y ANALISIS ESTADISTICO DE LAS REGIONES H II DE VARIAS GALAXIAS ESPIRALES DE GRAN DISEÑO, DE LAS QUE SE HAN OBTENIDO IMAGENES DE CALIDAD FOTOMETRICA Y GRAN RESOLUCION ANGULAR: POSICIONES, TAMAÑOS, FLUJOS, ETC. EL ANALISIS DE ESTAS PROPIEDADES HA DADO LUGAR AL DESCUBRIMIENTO DE UNA

We study star formation processes in the disc of the weakly barred grand design spiral galaxy M100 (NGC 4321) from a variety of images tracing recent massive star formation, old and young stars, dust and neutral hydrogen. Differences between arm and interarm regions are specifically studied by decomposing the images into arm and non-arm zones. We

Using the William Herschel Telescope ISIS spectrograph, deep long-slit spectra were obtained of the ionized gas across the blue compact dwarf galaxy I Zw 18 and in an irregular galaxy located 15" to the northwest. Heliocentric radial velocities of H alpha and H beta emission lines were measured over a 50" length spanning the main body of I Zw 18