GALINDO-GUIL, F. J.; BARRADO, D.; BOUY, H.

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GALINDO-GUIL, F. J.
Centro de Astrobiologia [Madrid] [CAB]

BARRADO, D.
Centro de Astrobiologia [Madrid] [CAB]

BOUY, H.
M2A 2017

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Highlights on Spanish Astrophysics IX, Proceedings of the XII Scientific Meeting of the Spanish Astronomical Society held on July 18-22, 2016, in Bilbao, Spain, ISBN 978-84-606-8760-3. S. Arribas, A. Alonso-Herrero, F. Figueras, C. Hernández-Monteagudo, A. Sánchez-Lavega, S. Pérez-Hoyos (eds.), 2017 , p. 505-505, 2016-07-18, Bilbao. 2017-03p. 505 - 505

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We present the study of the open cluster ASCC-20. This young stellar association located at 450 pc and A_V = 0.129 mag is ˜ 20 Myr old based on the upper main sequence fitting. We have created a multi-wavelength photometric catalogue of cluster candidate members by using archival data and data-mining techniques. The complete set of photometric bands contains: B_TV_T from Tycho-2, griz from SDSS, JHK_s from 2MASS and W1W2W3W4 from WISE. In addition, we have followed-up 36 of our photometric candidates by using spectroscopic data with CAHA-TWIN. We have derived spectral types and confirmed their membership: 1) 50% of these sources are M dwarfs with the Hα spectral feature in emission; 2) models (Allard et al., 2012) indicate a mass of ˜0.25 M_{⊙} for the faintest object confirmed by spectroscopy, a M7. We have re-observed a subsample of 11 confirmed members of M spectral type and measured features related with their youth (e.g.: Li at 6707.8 Å) and metallicities by using GTC-OSIRIS at mid-resolution. Assuming a distance of 450 pc we report a Lithium Depletion Boundary age above 30 Myr, based on the faintest member of our sample without lithium (a M7). However a new study of the distance with Gaia will release a new insigth in the age of this cluster.< Réduire

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Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804