The International Research on the Interior of the Sun (IRIS) helioseismometer measures the full disk line of sight velocity of the Sun. In fact, it makes a photometric mesurement using two monochromatic spectral windows located on the wings of the D1 solar line. This is a non-linear measurement. Before a scientific exploitation of the IRIS data

EN ESTE TRABAJO SE PRESENTAN LOS RESULTADOS DEL CARTOGRAFIADO DE 225 GRADOS 2 DEL PLANO GALACTICO EN 2.2 MICRAS. ESTOS MUESTRAN LA EXISTENCIA DE UNA GRAN CONCENTRACION DE ESTRELLAS BRILLANTES EN EL CENTRO GALACTICO CON UN RADIO DE 500 PC, QUE SE HA DENOMINADO BULBO INTERNO. SU FUNCION DE LUMINOSIDAD NO TIENE UNA FORMA SUAVE, SINO QUE ESTA DOMINADA

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We present the first infrared ellipsoidal study of a low-mass X-ray binary system, and hence measure the mass of the neutron star. Photometry of Cen X-4 obtained during 1990-91 allows us to determine the quiescent light curve. By fitting this light curve with an ellipsoidal model we revise the ephemeris, obtain solutions in the mass ratio

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Results are presented from a large observational project directed toward the detection of solar-like oscillations in an ensemble of open cluster stars. Seven groups collaborated in 1992 January to observe twelve stars in M67 with 4 m class telescopes for a one week period. High quality time series were collected on 22 telescope nights for a total