Bibcode
Deshpande, R.; Martín, E. L.; Montgomery, M. M.; Zapatero Osorio, M. R.; Rodler, F.; del Burgo, C.; Phan Bao, N.; Lyubchik, Y.; Tata, R.; Bouy, H.; Pavlenko, Y.
Referencia bibliográfica
The Astronomical Journal, Volume 144, Issue 4, article id. 99 (2012).
Fecha de publicación:
10
2012
Número de citas
39
Número de citas referidas
36
Descripción
We present observations of 36 late M dwarfs obtained with the Keck
II/NIRSPEC in the J band at a resolution of ~20,000. We have measured
projected rotational velocities, absolute radial velocities, and
pseudo-equivalent widths of atomic lines. Twelve of our targets did not
have previous measurements in the literature. For the other 24 targets,
we confirm previously reported measurements. We find that 13 stars from
our sample have v sin i below our measurement threshold (12 km
s-1) whereas four of our targets are fast rotators (v
sin i > 30 km s-1). As fast rotation causes spectral
features to be washed out, stars with low projected rotational
velocities are sought for radial velocity surveys. At our intermediate
spectral resolution, we have confirmed the identification of neutral
atomic lines reported in McLean et al. We also calculated
pseudo-equivalent widths of 12 atomic lines. Our results confirm that
the pseudo-equivalent width of K I lines is strongly dependent on
spectral types. We observe that the pseudo-equivalent width of Fe I and
Mn I lines remains fairly constant with later spectral type. We suggest
that these lines are particularly suitable for deriving metallicities
for late M dwarfs.
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Savita
Mathur