Low-resolution optical spectra of ultracool dwarfs with OSIRIS/GTC

Bibcode
2015MNRAS.446.3878M
DOI
10.1093/mnras/stu2370
Metodieva, Y.; Antonova, A.; Golev, V.; Dimitrov, D.; García-Álvarez, D.; Doyle, J. G.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 446, Issue 4, p.3878-3884

Fecha de publicación:
2
2015
Revista
Monthly Notices of the Royal Astronomical Society
Número de autores
6
Número de autores del IAC
1
Número de citas
12
Número de citas referidas
12
Descripción
We present the results of low-resolution optical spectroscopy with OSIRIS/GTC (Optical System for Imaging and Low Resolution Integrated Spectroscopy/Gran Telescopio Canarias) for a sample of ultracool dwarfs. For a subsample of seven objects, based on 2 Micron Sky Survey (2MASS) NIR photometric colours, a `photometric' spectral type is determined and compared to the results of the optical spectroscopy. For the stars, showing Hα line in emission, equivalent widths were measured, and the ratio of Hα to bolometric luminosity were calculated. We find that two dwarfs show the presence of magnetic activity over long periods, LP 326-21 - quasi-constant-like, and 2MASS J17071830+6439331 - variable.
Proyectos relacionados
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Abundancias Químicas en Estrellas
La espectroscopía de estrellas nos permite determinar las propiedades y composiciones químicas de las mismas. A partir de esta información para estrellas de diferente edad en la Vía Láctea es posible reconstruir la evolución química de la Galaxia, así como el origen de los elementos más pesados que el boro, forjados principalmente en los interiores
Carlos
Allende Prieto
En ejecución
Tipo
Con árbitro
Física estelar e interestelar (FEEI)
Cromosferas

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