Astrofísicas: Función de luminosidad

  • Publicación
    On the Galactic globular cluster Delta VHBbump parameter .
    We calculated new estimates of the Delta VHBbump parameter for 15 Galactic Globular Clusters (GGCs) using accurate ground-based photometric data. We enlarged...
  • Publicación
    On the importance of the few most massive stars: The ionizing cluster of NGC 588
    We present the results of a double analysis of the ionizing cluster in NGC 588, a giant HII region (GHR) in the outskirts of the nearby galaxy M 33. For this...
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    Optical and infrared photometry of new very low-mass stars and brown dwarfs in the sigma Orionis cluster
    We present an RI photometric survey covering an area of 430 arcmin2 around the multiple star sigma Orionis. The observations were conducted with the 0.8 m IAC...
  • Charla
    Optical and infrared studies of Galactic open clusters
    In the first (optical) part, we present our recent results on mass and luminosity function of Galactic open clusters, a new statistical study based on the ASCC...
  • Publicación
    Optical and Near-infrared Spectra of σ Orionis Isolated Planetary-mass Objects
    We have obtained low-resolution optical (0.7–0.98 μm) and near-infrared (1.11–1.34 μm and 0.8–2.5 μm) spectra of 12 isolated planetary-mass candidates (J = 18.2...
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    Pleiades low-mass brown dwarfs: the cluster L dwarf sequence
    Aims.We present a search for low-mass brown dwarfs in the Pleiades open cluster. The identification of Pleiades members fainter and cooler than those currently...
  • Publicación
    Probing the Upper Scorpius mass function in the planetary-mass regime
    We present the results of a deep ZYJ near-infrared survey of 13.5 deg2 in the Upper Scorpius (USco) OB association. We photometrically selected ˜100 cluster...
  • Publicación
    Proper motions of USco T-type candidates
    We present new z- and H-band photometry and proper motion measurements for the five candidate very-low-mass T-type objects we recently proposed to be members of...
  • Publicación
    Sampling methods for stellar masses and the mmax-Mecl relation in the starburst dwarf galaxy NGC 4214
    It has been claimed in the recent literature that a non-trivial relation between the mass of the most-massive star, mmax, in a star cluster and its embedded...