Astrophysical: Main sequence stars

  • Publication
    A search for MG 2 H and K emission core variability in six main sequence stars
    Spectra of six main sequence stars with spectral types from F0 to G8 were obtained with the IUE long wavelength spectrograph at high resolution. Four or more...
  • Publication
    An empirical approach to the location of the theoretical isochrones in the observational plane
    A new empirical calibration of the (B-V) index versus the three fundamental stellar parameters T(eff), (Fe/H), and log g is presented whose range of validity is...
  • Publication
    An empirical colour-T(eff) calibration for G and K dwarf and subdwarf stars
    Infrared observations are used to obtain effective temperatures with a 3-percent error for a sample of low main-sequence stars. The empirical calibration of...
  • Publication
    An optical time-resolved spectroscopic study of SS Cygni. 1: Quiescence
    In this work we analyze time-resolved spectra of SS Cygni in quiescence. The geometrical and orbital fundamental parameters of the system are determined. When...
  • Publication
    Blue stragglers in open clusters - A test of the binary hypothesis
    A search for binaries among 17 blue stragglers in five galactic clusters, NGC 7789, 6633, 6819, 6939, and M 67, has been performed using measurements of radial...
  • Publication
    CCD photometry of stars in the old open cluster NGC 188
    CCD photometry for stars in three fields centered on the old open cluster NGC 188 is presented, with the aim of investigating the HR diagram distribution of...
  • Publication
    CCD UBVR photometry of the old rich open cluster King 2 - Comparison with theoretical models
    In this paper we present the Johnson-Cousins UBVR CCD photometry of the stars in King 2, an old open cluster towards the galactic anticenter. We have obtained...
  • Publication
    High-velocity outflows in post-Main-Sequence nebulae
    Observations of three post-Main-Sequence nebulae, taken with an intermediate dispersion spectrograph mounted on the 2.5 m Isaac Newton Telescope (La Palma...
  • Publication
    Infrared photometry of open clusters - The main sequence of NGC 752
    New infrared photometry of a sample of 39 stars in the open cluster NGC 752 is presented. These observations confirm the bimodality of the main sequence...