The CARMENES search for exoplanets around M dwarfs
- D. Hintz
- B. Fuhrmeister
- S. Czesla
- J. H. M. M. Schmitt
- E. N. Johnson
- A. Schweitzer
- J. A. Caballero
- M. Zechmeister
- S. V. Jeffers
- A. Reiners
- I. Ribas
- P. J. Amado
- A. Quirrenbach
- G. Anglada-Escudé
- F. F. Bauer
- V. J. S. Béjar
- M. Cortés-Contreras
- S. Dreizler
- D. Galadí-Enríquez
- E. W. Guenther
- P. H. Hauschildt
- A. Kaminski
- M. Kürster
- M. Lafarga
- M. López del Fresno
- D. Montes
- J. C. Morales
- V. M. Passegger
- W. Seifert
DOIAbstract
Chromospheric modeling of observed differences in stellar activity lines is imperative to fully understand the upper atmospheres of late-type stars. We present one-dimensional parametrized chromosphere models computed with the atmosphere code PHOENIX using an underlying photosphere of 3500 K. The aim of this work is to model chromospheric lines of a sample of 50 M2–3 dwarfs observed in the framework of the CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, exoplanet survey. The spectral comparison between observed data and models is performed in the chromospheric lines of Na
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