Astrophysical: Techniques

  • Publication
    Additional spectra of asteroid 1996 FG3, backup target of the ESA MarcoPolo-R mission
    Context. Near-Earth binary asteroid (175706) 1996 FG3 is the current backup target of the ESA MarcoPolo-R mission, selected for the study phase of ESA M3...
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    Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. II. Age dependencies and new insights
    Context. Models of stellar structure and evolution can be constrained by measuring accurate parameters of detached eclipsing binaries in open clusters. Multiple...
  • Publication
    Age and metallicity gradients support hierarchical formation for M87
    In order to probe the inside-out formation of the most massive galaxies in the Universe, we have explored the radial (0.1 ≲ R ≲ 8 kpc) variation of the spectral...
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    Ages of LMC star clusters using ASAD2
    We use ASAD2, the new version of ASAD (Analyzer of Spectra for Age Determination), to obtain the age and reddening of 27 Large Magellanic Cloud (LMC) clusters...
  • Publication
    Ammonia-methane ratios from H-band near-infrared spectra of late-T and Y dwarfs
    Aims: Our goals are to investigate the relative absorption strengths of ammonia and methane using low-resolution H-band (1.5−1.7 microns) spectra obtained in...
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    An active region filament studied simultaneously in the chromosphere and photosphere. I. Magnetic structure
    Aims: A thorough multiwavelength, multiheight study of the vector magnetic field in a compact active region filament (NOAA 10781) on 2005 July 3 and 5 is...
  • Publication
    An active region filament studied simultaneously in the chromosphere and photosphere. II. Doppler velocities<xref ref-type="fn" rid="FN1">
    Context. Paper I presents the magnetic structure, inferred for the photosphere and the chromosphere, of a filament that developed in active region (AR) NOAA...
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    An asteroseismic study of the β Cephei star θ Ophiuchi: spectroscopic results
    We present the results of a detailed analysis of 121 ground-based high-resolution, high signal-to-noise ratio spectroscopic measurements spread over 3 yr for...
  • Publication
    An automated system to classify stellar spectra - I
    Analyses of stellar spectra often begin with the determination of a number of parameters that define a model atmosphere. This work presents a prototype for an...