The VLT/X-shooter spectral library of M subdwarfs

N. Lodieu1,2*
1Instituto de Astrofísica de Canarias (IAC), Calle Vía Láctea s/n, E-38200 La Laguna, Tenerife, Spain 2Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38205 La Laguna, Tenerife, Spain

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We present a library of intermediate-resolution (R=4000-6700) optical to NIR (400-2500 nm) spectra of metal-poor M dwarfs with metallicities (Fe/H) below -0.5 dex collected with the X-shooter spectrograph on the ESO Very Large Telescope. We present spectroscopic sequences and derive preliminary physical parameters comparing our observed spectra with the state-of-the-art BT-Settl models.

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Keywords : subdwarfs – spectral classification – models