Passegger, V. M.; Schweitzer, A.; Shulyak, D.; Nagel, E.; Hauschildt, P. H.; Reiners, A.; Amado, P. J.; Caballero, J. A.; Cortés-Contreras, M.; Domínguez-Fernández, A. J.; Quirrenbach, A.; Ribas, I.; Azzaro, M.; Anglada-Escudé, G.; Bauer, F. F.; Béjar, V. J. S.; Dreizler, S.; Guenther, E. W.; Henning, T.; Jeffers, S. V.; Kaminski, A.; Kürster, M.; Lafarga, M.; Martín, E. L.; Montes, D.; Morales, J. C.; Schmitt, J. H. M. M.; Zechmeister, M.
Bibliographical reference
Astronomy and Astrophysics, Volume 627, id.A161, 15 pp.
Description
We present precise photospheric parameters of 282 M dwarfs determined
from fitting the most recent version of PHOENIX models to
high-resolution CARMENES spectra in the visible (0.52-0.96 μm) and
NIR wavelength range (0.96-1.71 μm). With its aim to search for
habitable planets around M dwarfs, several planets of different masses
have been detected. The characterization of the target sample is
important for the ability to derive and constrain the physical
properties of any planetary systems that are detected. As a continuation
of previous work in this context, we derived the fundamental stellar
parameters effective temperature, surface gravity, and metallicity of
the CARMENES M-dwarf targets from PHOENIX model fits using a
χ2 method. We calculated updated PHOENIX stellar
atmosphere models that include a new equation of state to especially
account for spectral features of low-temperature stellar atmospheres as
well as new atomic and molecular line lists. We show the importance of
selecting magnetically insensitive lines for fitting to avoid effects of
stellar activity in the line profiles. For the first time, we directly
compare stellar parameters derived from multiwavelength range spectra,
simultaneously observed for the same star. In comparison with literature
values we show that fundamental parameters derived from visible spectra
and visible and NIR spectra combined are in better agreement than those
derived from the same spectra in the NIR alone.
Full Tables B.1 and B.2 are only available at the CDS via anonymous ftp
to
http://cdsarc.u-strasbg.fr
(
ftp://130.79.128.5) or via
http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/627/A161
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