We report on the linear polarimetric observations in the Johnson I-band filter of 44 ultracool dwarfs with spectral types between M6 and L7.5, corresponding to effective temperatures in the range 2800-1400 K, and one M4.5-type star. Based on our measurements of polarization (P) and their associated error bars (σP), 11 (10 L and 1 M) dwarfs appear

Las estrellas en rotación tienen gran importancia en Astrosismología. En la actualidad, existe una gran cantidad de observaciones de estrellas de tipo delta Scuti en las cuales se han detectado frecuencias de oscilación, aunque su estructura no está aún bien entendida. Desafortunadamente, hasta la fecha, los métodos disponibles para calcular las

Planetary nebulae (PNe) are known to possess a variety of small-scale structures that are usually in a lower ionization state than the main body of the nebulae. The morphological and kinematic properties of these low-ionization structures (LISs) vary from type to type in the sense that LISs can appear in the form of pairs of knots, filaments, jets

The knowledge of the properties of supernovae (SNe) at optical wavelengths has experienced enormous progress in the current decade. In contrast, comparatively little is known about the SN behaviour in the near-infrared (NIR) window. Such a knowledge would give us relevant clues to key questions related to the nature of SN progenitors and to the

The kinematic properties of the gaseous and stellar components of 11 ultraluminous infrared galaxies (ULIRGs; 14 nuclei) are investigated by means of integral field spectroscopy (IFS) with the INTEGRAL system and available IR and CO millimeter spectroscopy. The sample of ULIRGs cover different phases of the merging process and span all levels of

Optical detections in five different fields of view (A, C, E, K, and L) are matched with the near-infrared detections described in this paper. The central coordinates of the five optical fields-of-view are as follows: (see Stauffer et al. 1999ApJ...527..219S for more details): A : RA = 03:27:10.0 DE = +49:24:00.0 C : RA = 03:24:50.0 DE = +48:42:00