Journal: Astronomy and Astrophysics

  • Publication
    The mysterious eruption of V838 Mon
    V838 Mon is marking one of the most mysterious stellar outbursts on record. The spectral energy distribution of the progenitor resembles an under-luminous F...
  • 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 nature of arms in spiral galaxies. II. The sample
    We present here the results of an imaging study of eight grand-design and two intermediate-arm galaxies, based on CCD observations in U, B, V, R and I. We give...
  • Publication
    The nature of arms in spiral galaxies. III. Azimuthal profiles
    In this paper we analyse the structure of a small sample of galaxies using a set of CCD images in standard photometric bands presented in a previous paper (del...
  • Publication
    The nature of comet-asteroid transition object (3200) Phaethon
    Context: The study of asteroids that present sporadic cometary activity is of fundamental importance to address several astronomical problems including the end...
  • Publication
    The nature of HH 223 from long-slit spectroscopy
    Context: HH 223 is a knotty, undulating nebular emission of ˜30 arcsec length found in the L723 star-forming region. It lies projected onto the largest...
  • Publication
    The nature of LINER galaxies:. Ubiquitous hot old stars and rare accreting black holes
    Context. Galaxies, which often contain ionised gas, sometimes also exhibit a so-called low-ionisation nuclear emission line region (LINER). For 30 years, this...