It is argued that internal gravity waves generated by the convective envelope of a star may be effective in producing a weak mixing in its radiative interior...
Li depletion in solar analogues with exoplanets. Extending the sample
Aims: We want to study the effects of the formation of planets and planetary systems on the atmospheric Li abundance of planet host stars. Methods: In this work...
Library of high and mid-resolution spectra in the CA II H & K, Hα, Hβ NA i D1, D2, and He i D3 line regions of F, G, K and M field stars
In this work we present spectroscopic observations centered in the spectral lines most widely used as optical indicators of chromospheric activity (Hα, Hβ, Ca...
Library of high-resolution UES echelle spectra of F, G, K and M field dwarf stars
We present a library of Utrecht echelle spectrograph (UES) observations of a sample of F, G, K and M field dwarf stars covering the spectral range from 4800...
Life in the fast lane: a direct view of the dynamics, formation, and evolution of the Milky Way's bar
Studies of the ages, abundances, and motions of individual stars in the Milky Way provide one of the best ways to study the evolution of disc galaxies over...
Lifecycle of a large-scale polar coronal pseudostreamer/cavity system
We report on an exceptional large-scale coronal pseudostreamer/cavity system in the southern polar region of the solar corona that was visible for approximately...
Light and Shadows over Petra: Astronomy and Landscape in Nabataean Lands
A statistical analysis of the orientation of Nabatean sacred monuments demonstrates that astronomical orientations were often part of an elaborated plan and...
LIGHT CURVE BEHAVIOUR IN C/1995 O1 (HALE-BOPP) - II; Changes in the activity between 13AU and 2.5AU pre-perihelion
Comet Hale-Bopp is, without doubt, one of the most important objects for cometary science which has ever been observed. The light curve is well-observed from a...
Light elements Na and Al in 58 bulge spheroid stars from APOGEE
We identified a sample of 58 candidate stars with metallicity [Fe/H] ≲ -0.8 that likely belong to the old bulge spheroid stellar population, and analyse their...