Astrophysical: Techniques

  • Publication
    Spectropolarimetric observations of an arch filament system with the GREGOR solar telescope
    Arch filament systems occur in active sunspot groups, where a fibril structure connects areas of opposite magnetic polarity, in contrast to active region...
  • Publication
    Spectropolarimetry in a sunspot penumbra. Spatial dependence of Stokes asymmetries in Fe I 1564.8 nm
    Stokes profiles of sunspot penumbrae show distinct asymmetries, which point to gradients in the velocity field and in the magnetic field. We present...
  • Publication
    Spectropolarimetry of 3C 265, a misaligned radio galaxy
    We present spectropolarimetry of the powerful radio galaxy 3C 265 at z=0.811. The rest-frame UV continuum, which has an elongated structure misaligned by about...
  • Publication
    Spectroscopic and dynamical properties of comet C/2018 F4, likely a true average former member of the Oort cloud
    Context. The population of comets hosted by the Oort cloud is heterogeneous. Most studies in this area have focused on highly active objects, those with small...
  • Publication
    Spectroscopic characterization of the known O-star population in Cygnus OB2. Evidence of multiple star-forming bursts
    Context. Cygnus OB2 provides a unique insight into the high-mass stellar content in one of the largest groups of young massive stars in our Galaxy. Although...
  • Publication
    Spectroscopic characterization of the stellar content of ultra-diffuse galaxies
    Understanding the peculiar properties of ultra-diffuse galaxies (UDGs) via spectroscopic analysis is a challenging task requiring very deep observations and...
  • Publication
    Spectroscopic classification of red high proper motion objects in the Southern Sky
    We present the results of spectroscopic follow-up observations for a sample of 71 red objects with high proper motions in the range 0.08-1.14 arcsec yr-1 as...
  • Publication
    Spectroscopic classification of X-ray selected stars in the rho Ophiuchi star-forming region and vicinity
    We present intermediate-resolution (FWHM~1.5-2.6 Angstroms) optical spectra of 106 candidate optical counterparts of 77 X-ray sources detected in four pointed...
  • Publication
    Spectroscopic hint of a cold stream in the direction of the globular cluster NGC 1851
    We present the results of a spectroscopic survey performed in the outskirts of the globular cluster NGC 1851 with VIsible MultiObject Spectrograph (VIMOS)/Very...