Pseudo-equivalent widths and Rotational Velocities of 36 Late M Dwarfs

Details Pseudo-equivalent widths and Rotational Velocities of 36 Late M Dwarfs Pseudo-equivalent widths and Rotational Velocities of 36 Late M Dwarfs

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21631609d&link_type=abstract

American Astronomical Society, AAS Meeting #216, #316.09; Bulletin of the American Astronomical Society, Vol. 41, p.897

Astronomy and Astrophysics

Astronomy

Scientific paper

As part of our radial velocity monitoring survey of late M dwarfs (SpT: M5.0-M9.5; J-Mag: 10.6-12.4) in the solar neighborhood (d < 30 parsec), we present pseudo-equivalent width and rotational velocities (v sini) of 36 late M dwarfs. The sample selection was carried out by considering (1) over 50% of targets with spectral type greater than M7.0; (2) stars that are not known to be binaries and fast rotators; (3) and with negligible stellar activity.
Spectra of our unique sample were obtained in the J band at intermediate resolution (R 20,000) with NIRSPEC on the Keck II telescope. We investigate the relation between spectral type and pseudo-equivalent width. As rotation of M dwarfs is a key element in understanding the intensity and spectroscopic features of the observed atomic lines, we study the effect of rotation in the spectra and present preliminary results.

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