Benchmark low-mass objects in Moving Groups
1 Centro de Astrobiología (CSIC-INTA). Crta, Ajalvil km 4. 28850 Torrejón de Ardoz, Madrid, Spain
2 Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK
3 Main Astronomical Observatory, Academy of Sciences of Ukraine, Golosiiv Woods, Kyiv-127, 03680, Ukraine
4 Department of Astronomy, Universidad de Chile, Casilla Postal 36D, Santiago, Chile
5 Department of Astronomy, University of Virginia, PO Box 400325, Charlottesville, VA 22904-4325, USA
6 Yunnan Observatory, PO Box 110. CAS. 650011 Kunming, PR China
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In order to compile a sample of ultracool dwarfs that will serve as benchmarks for testing theoretical formation and evolutionary models, we selected low-mass cool (>M7) objects that are potentially members of five known young Moving Groups in the solar neighbourhood.
We have studied the kinematics of the sample, finding that 49 targets belong to the young disk area, from which 36 are kinematic member of one of the five moving groups under study. Some of the identified low-mass members have been spectroscopically characterised (Teff, log g) and confirmed as young members through a detailed study of age indicators.
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