Journal: Astronomy and Astrophysics

  • Publication
    Deep probing of the photospheric sunspot penumbra: no evidence of field-free gaps
    Context. Some models for the topology of the magnetic field in sunspot penumbrae predict regions free of magnetic fields or with only dynamically weak fields in...
  • Publication
    Deep SDSS optical spectroscopy of distant halo stars. I. Atmospheric parameters and stellar metallicity distribution
    Aims: We analyze a sample of tens of thousands of spectra of halo turnoff stars, obtained with the optical spectrographs of the Sloan Digital Sky Survey (SDSS)...
  • Publication
    Deep SDSS optical spectroscopy of distant halo stars. II. Iron, calcium, and magnesium abundances
    Aims: We analyze a sample of 3944 low-resolution (R ~ 2000) optical spectra from the Sloan Digital Sky Survey (SDSS), focusing on stars with effective...
  • Publication
    Deep SDSS optical spectroscopy of distant halo stars. III. Chemical analysis of extremely metal-poor stars
    Aims: We present the results of an analysis of 107 extremely metal-poor (EMP) stars with metallicities lower than [Fe/H] =- 3.0, identified in medium-resolution...
  • Publication
    Deep wide-field imaging down to the oldest main sequence turn-offs in the Sculptor dwarf spheroidal galaxy
    We present wide-field photometry of resolved stars in the nearby Sculptor dwarf spheroidal galaxy using CTIO/MOSAIC, going down to the oldest main sequence turn...
  • Publication
    DeepVel: Deep learning for the estimation of horizontal velocities at the solar surface
    Many phenomena taking place in the solar photosphere are controlled by plasma motions. Although the line-of-sight component of the velocity can be estimated...
  • Publication
    delta Scuti stars in Praesepe I. The STACC 1998 campaign - the photometry
    We present the results of the multisite differential CCD photometry for the two delta Scuti stars, BN and BV Cnc, in the open cluster Praesepe. The main...
  • Publication
    Density discrepancy between transit-timing variations and radial velocity: Insights from the host star composition
    Context. The determination of planetary densities from the masses derived with the radial velocity (RV) and transit-timing variation (TTV) methods reveals...
  • Publication
    Density waves and star formation in grand-design spirals
    Context. H II regions in the arms of spiral galaxies are indicators of recent star-forming processes. They may have been caused by the passage of the density...