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http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1924| Intermediate Resolution Near-Infrared Spectroscopy of 36 late-M Dwarfs | |
| Carlos del Burgo Díaz | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| Planetary system Stars: low-mass, brown dwarfs Stars: fundamental parameters, equivalent width Stars: rotation, heliocentric velocity Techniques: radial velocity | |
| 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. | |
| The Astronomical Journal | |
| 11-07-2012 | |
| Artículo | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| Deshpande, R., et al., (2012), Intermediate Resolution Near-Infrared Spectroscopy of 36 late-M Dwarfs, The Astronomical Journal, Vol.144(4):1-30 | |
| ASTRONOMÍA Y ASTROFÍSICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Artículos de Astrofísica |
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