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.
Bibliographical reference

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

Advertised on:
2
2015
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
6
IAC number of authors
1
Citations
12
Refereed citations
12
Description
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.
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Stellar spectroscopy allows us to determine the properties and chemical compositions of stars. From this information for stars of different ages in the Milky Way, it is possible to reconstruct the chemical evolution of the Galaxy, as well as the origin of the elements heavier than boron, created mainly in stellar interiors. It is also possible to

Carlos
Allende Prieto
In progress
Type
Refereed
Chromospheres
Stellar & Interstellar Physics (FEEI)

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