Low-frequency p-modes have relatively small amplitudes and are set against the background of granulation on the solar surface. In this work, the calibrated signals of both the MDI and GOLF instruments are processed in the following steps: 1) prewhitening 2) signal extraction and demodulation in given frequency bands and 3) separation of noise and

The energy calculation of the p-modes requires accurate estimates of both amplitudes and linewidths. These parameters can be derived from a suitable model used to fit the spectral distribution of the mode. In this poster we describe the technique used to achieve this goal. The model chosen to represent the power spectrum of a solar oscillation is a

The authors have studied the global properties of 51 compact field galaxies with redshifts z ≡ 0.2 - 1.3 and apparent magnitudes I814 23.74 in the flanking fields of the Hubble Deep Field. Keck spectra covering ≡4000 - 8000 Å, combined with HST I814 images and Keck V band images were used to derive redshifts, V606 - I814 colors, absolute blue

New near-infrared (NIR) observations of galaxies with circumnuclear starbursts and of Seyfert galaxies have shown both the importance of high-resolution imaging in the NIR, and of non-axisymmetric structures (e.g. bars) in the process of fuelling the central regions. I will discuss recent results of imaging surveys showing that the presence of a

About 200 CCD images of the comet C/1996 B2 - HYAKUTAKE were obtained and reduced, using four approaches by PPM stars and one by a GSC star, on March 20, 24, 25 and April 1-st, 1996, in Bucharest. Also, three photographical plates were reduced using PPM stars. The O-C analysis of the astrometric data allowed the testing of the accuracy of both the

We have discovered a relatively large number of brown dwarf candidates in the Pleiades young open cluster as a result of a deep CCD IZ survey covering 1 deg^2 down to limiting magnitudes I ~22 and Z ~21. Follow-up infrared photometry and low/intermediate-resolution spectroscopy of seven of our candidates in the interval 20 > I > 17.8 allow us to