• Publication
    The Na-O anticorrelation in horizontal branch stars. IV. M 22
    We obtained high-resolution spectra for 94 candidate stars belonging to the HB of M 22 with FLAMES. Previous works have indicated that this cluster has split...
  • Publication
    The Na-O anticorrelation in horizontal branch stars. V. NGC 6723
    We used FLAMES+GIRAFFE (Medusa mode) at the VLT to obtain moderately high resolution spectra for 30 red horizontal branch (RHB) stars, 4 RR Lyrae variables, and...
  • Publication
    The NaI resonance lines as a spectroscopic test of late-type stellar atmospheres.
    We have tested current models for the atmospheres (including photosphere and low chromosphere) of late-type stars using the D resonance lines of neutral sodium...
  • Publication
    The Narrow-Line Region of the Seyfert 2 Galaxy Mrk 78: An Infrared View
    We report near-infrared spectroscopic data for the Seyfert 2 galaxy Mrk 78, taken with the LIRIS near-infrared camera/spectrometer at the William Herschel...
  • Publication
    The Nature and Evolution of Classical Double Radio Sources from Complete Samples
    We present a study of the trends in luminosity, linear size, spectral index, and redshift of classical double radio sources, from three complete samples...
  • Publication
    The Nature and Nurture of Bars and Disks
    The effects that interactions produce on galaxy disks and how they modify the subsequent formation of bars need to be distinguished to fully understand the...
  • Publication
    The nature and origin of substructure in the outskirts of M31 - II. Detailed star formation histories
    While wide-field surveys of M31 have revealed much substructure at large radii, understanding the nature and origin of this material is not straightforward from...
  • Publication
    The Nature and Size of the Optical Continuum Source in QSO 2237+0305
    From the peak of a gravitational microlensing high-magnification event in the A component of QSO 2237+0305, which was accurately monitored by the Gravitational...
  • Publication
    The nature and structure of the emission line nebula K3-35: a very young planetary nebula with precessing bipolar jet-like outflows?
    We present Hα, [NII]6583 and 6-cm continuum images of the emission line nebula K3-35. The optical images reveal an extended nebula (size ~=11x9arcsec^2 in [NII]...