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...
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PublicationThe CARMENES search for exoplanets around M dwarfs. Variability of the He I line at 10 830 Å
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PublicationThe 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...
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PublicationThe 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...
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PublicationThe 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...
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PublicationThe 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...
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Publicationβ1 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...