The empirical study of confirmed brown dwarfs began in 1995. Until this year, however, no ironclad examples of free-floating field brown dwarfs have been confirmed. Recently three excellent candidates have been discovered --- bright enough to obtain high resolution spectra with the Keck 10-m telescope. Two of our targets clearly show the lithium

Amongst the different techniques applied up to now to the search for solar g--modes (peaks identification, study of the phase/power coherence, the P0 - nur diagrams, etc ldots), some ones are primarily based on the use of their asymptotic behaviour: the constant separation in period between consecutive modes of the same degree ell. The exact

Preliminary results from bidimensional long-slit spectroscopic observations of the prototypical low-metallicity dwarf galaxy I Zw 18 are presented. Eight evenly spaced slit positions were observed in order to cover the body of the galaxy and part of the ionized halo seen in deep H alpha images. The study of the ionization structure and the

HR 3126 is an M2 II giant surrounded by the bipolar reflection nebula IC2220. A sensitive R-band image obtained with the ESO 3.6 m telescope shows that the nebula has a size of at least 10', corresponding to a linear size of about 1 pc, and is extended in the east-west direction. CO(1-0), CO(2-1), and 13CO(1-0) maps obtained with the Swedish-ESO

A view of the horizontal velocity flows in the upper layers of the convection zone is presented. In order to produce the synoptic map, 120 sections of about 15 degrees square have been studied using a ring diagram analysis. The area analyzed extends 75 degrees in latitude and 360 degrees in longitude. The sections were individually tracked over

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