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| Paper: |
Extracting the Physical Parameters of a Sample of M-dwarfs from High-resolution Near-infrared Spectra |
| Volume: |
472, New Quests in Stellar Astrophysics III: A Panchromatic View of Solar-like Stars, With and Without Planets |
| Page: |
53 |
| Authors: |
del Burgo, C.; Martín, E. L.; Zapatero Osorio, M. R.; Deshpande, R.; Witte, S.; Helling, C.; Hauschildt, P. H. |
| Abstract: |
This study is part of an effort to determine the physical and kinematical properties
of a sample of 36 nearby late M-dwarfs, with spectral types M5-M9.5.
They are the targets of a program to search for exoplanets orbiting around them from
the radial velocity method using the near-infrared echelle spectrograph
NIRSPEC on the Keck II telescope.
Preliminary results about the effective temperature, surface gravity, and rotational
broadening of a subsample of nine M-dwarfs are presented.
The analysis is based on the comparison of the spectra obtained in the J–band with a
high resolving power of 22,000
and stellar atmosphere synthetic models using the PHOENIX and the PHOENIX/DRIFT codes.
This study shows that the strong potassium absorption doublet at 12432 and 12522 Å is
useful to determine the effective temperature.
Our results are of interest for the new generation of near-infrared spectrographs
that are being developed to measure radial velocities with unprecedented precisions
of a few ms-1, for which accurate theoretical models for comparison are needed. |
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