Bibcode
Deshpande, Rohit; Martin, E. L.; Montgomery, M. M.; Lyubchik, Y.; Zapatero Osorio, M. R.; Rodler, F.; del Burgo, C.; Pavlenko, Y.
Referencia bibliográfica
American Astronomical Society, AAS Meeting #215, #606.04; Bulletin of the American Astronomical Society, Vol. 36, p.1130
Advertised on:
1
2010
Número de citas
0
Número de citas referidas
0
Descripción
We present preliminary results of line identification and equivalent
width measurements in spectra of late M Dwarfs. We obtained 3.5 nights
on Keck NASA time to collect high resolution (R 20,000) near-infrared
(J-band) spectra using the NIRSPEC instrument on the Keck II telescope.
Our sample consists of 40 nearby (distance < 20 pc) late M dwarfs
(spectral type M5 - M9.5). Using VALD database we identified new atomic
lines and verified them by comparing our results to those obtained
through models of synthetic spectra. We obtained equivalent width of new
and previously observed atomic lines. Our results of existing atomic
lines compare well with those from Cushing et al. 2005. We observe a
linearly increasing trend in equivalent widths of strong lines such as K
I l while a decreasing trend is found in weakening lines like Na I.