Journal: Astronomy and Astrophysics

  • Publication
    An analysis of HST UV spectra of Cyg OB2 stars
    As a first step of a vigorous program to investigate the Wind Momentum - Luminosity Relationship (WLR) of Galactic O-stars by analyzing stars belonging to the...
  • Publication
    An analysis of STIS HST UV spectra of M 33 early B supergiants
    We present terminal velocities of M 33 B-supergiants, obtained from STIS HST spectra as part of our programme to investigate the Wind Momentum - Luminosity...
  • Publication
    An artificial neural network approach to the solution of molecular chemical equilibrium
    A novel approach is presented for the solution of instantaneous chemical equilibrium problems. The chemical equilibrium can be considered, due to its...
  • Publication
    An eclipsing double-line spectroscopic binary at the stellar/substellar boundary in the Upper Scorpius OB association
    Aims: We aim at constraining evolutionary models at low mass and young ages by identifying interesting transiting system members of the nearest OB association...
  • Publication
    An effective temperature calibration for solar type stars using equivalent width ratios. A fast and easy spectroscopic temperature estimation
    Aims: Precise determination of the stellar effective temperature of solar type stars is extremely important for astrophysics. We present an effective...
  • Publication
    An equatorial ultra iron-poor star identified in BOSS
    We report the discovery of SDSS J131326.89-001941.4, an ultra iron-poor red giant star ([Fe/H] ≃ -4.3) with a very high carbon abundance ([C/Fe] ≃ +2.5). This...
  • Publication
    An ESPRESSO view of the HD 189733 system. Broadband transmission spectrum, differential rotation, and system architecture
    Context. The development of state-of-the-art spectrographs has ushered in a new era in the detection and characterization of exoplanetary systems. The...
  • Publication
    An estimate of the solar background irradiance power spectrum.
    Knowledge of the solar irradiance background is of great importance to solar and stellar physics. In particular, its contribution to the solar oscillations...
  • Publication
    An evolutionary sequence of expanding hydrogen shells in galaxy discs
    Aims:Large HI shells, with diameters of hundreds of pc and expansion velocities of 10-20 km s-1 have been detected in their hundreds in the Milky Way and are...