Journal: Astronomy and Astrophysics

  • 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...
  • Publication
    An evolved donor star in the long-period cataclysmic variable HS 0218+3229
    Context: We present time-resolved spectroscopy and photometry of HS 0218+3229, a new long-period cataclysmic variable discovered within the Hamburg Quasar...
  • Publication
    An extension of Herschel's method for dense and extensive catalogues. Application to the determination of solar motion
    We present a way of handling and interpreting stellar proper motions, in which the idea of substituting them by great circles, proposed by Herschel in 1783...