Le 18 novembre 2015
De 14h00 à 15h00
Anaïs GONNEAU
Instituto de Astrofisica de Canarias
The X-shooter Spectral Library (XSL) is a state-of-art stellar spectral library, which will be a benchmark library for stellar population studies in the era of James Webb Space Telescope and the European Extremely Large Telescope. I will present the library and also describe shortly the data reduction done beforehand. Among the diversity of stars available within XSL, I focused during my PhD on carbon stars. Our sample contains stars with a broad range of (J-K) color and pulsation properties, located in the Milky Way and the Magellanic Clouds. In addition, we showed that our sample becomes bimodal for (J-K) > 1.6, with the presence or absence of the absorption feature at 1.53μm, generally associated with HCN and C2H2. We compared those spectra with hydrostatic carbon-rich models, in order to determine their fundamental parameters, and also to see if the optical-to-near infrared SEDs can be matched reasonably well, for stars with little or no evidence of circumstellar dust.