Título
Intermediate Resolution Near-Infrared Spectroscopy of 36 late-M Dwarfs
Autor
Carlos del Burgo Díaz
Nivel de Acceso
Acceso Abierto
Materias
Planetary system - (INSPEC) Stars: low-mass, brown dwarfs - (INSPEC) Stars: fundamental parameters, equivalent width - (INSPEC) Stars: rotation, heliocentric velocity - (INSPEC) Techniques: radial velocity - (INSPEC) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI)
Resumen o descripción
We present observations of 36 late-M dwarfs obtained with the KeckII/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. 12 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 (𝜐 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 theidentification of neutral atomic lines reported in McLean et al. (2007). We also calculated pseudo-equivalent widths (p-EW) of 12 atomic lines. Our results confirm that the p-EW of K I lines are strongly dependent on spectral types. We observe that the p-EW of Fe I and Mn I lines remain fairly constant with later spectral type. We suggest that those lines are particularly suitable for deriving metallicities for late-M dwarfs.
Editor
The Astronomical Journal
Fecha de publicación
11 de julio de 2012
Tipo de publicación
Artículo
Versión de la publicación
Versión aceptada
Recurso de información
Formato
application/pdf
Idioma
Inglés
Audiencia
Estudiantes
Investigadores
Público en general
Sugerencia de citación
Deshpande, R., et al., (2012), Intermediate Resolution Near-Infrared Spectroscopy of 36 late-M Dwarfs, The Astronomical Journal, Vol.144(4):1-30
Repositorio Orígen
Repositorio Institucional del INAOE
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