A negative sign was omitted from the absolute magnitude estimate of M32's bulge. In the last sentence of the fifth paragraph of § 2.1, it should read -16.34.

We are developing a project aimed at studying the physical properties, origin and evolution of low-ionization structures in planetary nebulae. Within this project we have identified a number of pairs of highly collimated low-ionization jet-like features (Gonçalves et al. 2001). In spite of being very similar to real jets, they have the intriguing

We report on our continuing effort to identify extremely low-mass members of the cluster around the hot star sigma Orionis. Using the KeckI telescope in Hawaii and the Isaac Newton telescope in La Palma, we carried out a deep near-infrared and optical search in an area of 55 square arcminutes, which has yielded the discovery of an object with blue

We present NLTE abundances of CNO for a sample of four O9 stars in the Galaxy, together with new determinations of their stellar parameters, T_eff, log g, epsilon (He) and microturbulence. These new analyses take into account the effect of line-blocking in the spectral synthesis with our classical NLTE, plane-parallel and hydrostatic model

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