Astrophysical: Chromospheres

  • Publication
    The CARMENES search for exoplanets around M dwarfs. The He I triplet at 10830 Å across the M dwarf sequence
    The He I infrared (IR) triplet at 10 830 Å is an important activity indicator for the Sun and in solar-type stars, however, it has rarely been studied in...
  • Publication
    The CARMENES search for exoplanets around M dwarfs. Variability of the He I line at 10 830 Å
    The He I infrared (IR) triplet at 10 830 Å is known as an activity indicator in solar-type stars and has become a primary diagnostic in exoplanetary...
  • Publication
    The CARMENES search for exoplanets around M dwarfs. Variability on long timescales as seen in chromospheric indicators
    It is clearly established that the Sun has an 11-yr cycle that is caused by its internal magnetic field. Such a cycle is also observed in a sample of M dwarfs...
  • Publication
    The CARMENES search for exoplanets around M dwarfs. Wing asymmetries of Hα, Na I D, and He I lines
    Stellar activity is ubiquitously encountered in M dwarfs and often characterised by the Hα line. In the most active M dwarfs, Hα is found in emission, sometimes...
  • Publication
    The Influence of Metallicity on Stellar Differential Rotation and Magnetic Activity
    Observations of Sun-like stars over the past half-century have improved our understanding of how magnetic dynamos, like that responsible for the 11 yr solar...
  • Publication
    The NaI resonance lines as a spectroscopic test of late-type stellar atmospheres.
    We have tested current models for the atmospheres (including photosphere and low chromosphere) of late-type stars using the D resonance lines of neutral sodium...
  • Publication
    β1 Monocerotis: oscillations and chromospheric structure
    β1 Monocerotis is a Be star with a V/R cycle of 12.5 years. We observed the star from CTIO (Chile) and with the IUE satellite and found that the star undergoes...