Astrofísicas: Estrellas G

  • Publicación
    A spectroscopic analysis of the G8V star Tau CET
    The physical parameters of Tau Cet are analyzed based on new and high-quality data. The effective temperature is determined to be 5250 + or - 50 K. The...
  • Publicación
    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...
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    Carbon abundances and isotope ratios in 70 bright M giants
    Approximate carbon abundances and C-12/C-13 isotope ratios are obtained for 70 M giant stars from intermediate-resolution spectrophotometry of the CO bands near...
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    Chromospheric modelling in late-type dwarfs. II - CES observations of active and quiescent stars
    The characteristics of the chromospheres of late-type dwarf stars were studied using the CoudeEchelle Spectrograph (CES) at ESO and the IUE. The study focused...
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    Determination of bolometric fluxes for F, G and K subdwarfs
    Bolometric fluxes for 118 dwarfs and subdwarfs with 4000K less than Teff less than 7000K and +0.5 less than (Fe/H) less than -3.5 are derived by integrating...
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    IUE MG II doublet observations in F and G main sequence stars
    Mg II resonance lines at 2800 A were studied in the spectra of F and G main sequence stars, observed with the IUE satellite in high resolution mode. Correlation...
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    Lithium and rotation in the Hyades late F and G stars
    Selecting stars with previously measured or estimated rotational periods we have measured equivalent widths of the Li doublet (6708 A) in 8 stars of the Hyades...
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    Metallicity effects on the T(eff) scale for main sequence stars
    Relations are presently established among T(eff), colors, and metallicity for a sample of Population I and II F and G main-sequence stars whose physical...
  • Publicación
    The G-dwarf problem - A tentative analytical approach, relaxing instantaneous recycling
    The general solution for the birth function B(m,t) of stars, derived by Casuso et al. (1989) was used to obtain a first-order analytical approximation to this...