Astronomy & Astrophysics manuscript no. cd-621346-10 c ESO 2018 October 11, 2018 CD-62◦1346: an extreme halo or hypervelocity CH star? ⋆ C.B. Pereira1, E. Jilinski1,2,3, N.A. Drake1,4, D.B. de Castro1, V.G. Ortega1, C.Chavero1,5 & F. Roig1 1 Observat´orio Nacional, Rua Jos´eCristino 77, CEP 20921-400, S˜ao Crist´ov˜ao, Rio de Janeiro-RJ. Brazil. 2 Instituto de F´ısica, Universidade do Estado do Rio de Janeiro, Rua S˜ao Francisco Xavier 524, Maracan˜a, 200550-900 Rio de Janeiro-RJ, Brazil 3 Pulkovo Observatory, Russian Academy of Sciences, 65, Pulkovo, 196140, St. Petersburg, Russia 4 Sobolev Astronomical Institute, St. Petersburg State University, Universitetski pr. 28, St. Petersburg 198504, Russia. 5 Observatorio Astr´onomico de C´ordoba, Laprida 854, C´ordoba, 5000, Argentina e-mail: claudio,jilinski,drake,denise,vladimir,carolina,
[email protected] Received ; accepted ABSTRACT Context. High-velocity halo stars provide important information about the properties of the extreme Galactic halo. The study of unbound and bound Population II stars permits us to better estimate the mass of the halo. Aims. We carried out a detailed spectroscopic and kinematic study and have significantly refined the distance and the evolutionary state of the star. Methods. Its atmospheric parameters, chemical abundances and kinematical properties were determined using high-resolution optical spectroscopy and employing the local-thermodynamic-equilibrium model atmospheres of Kurucz and the spectral analysis code moog. ◦ Results. We found that CD-62 1346 is a metal-poor ([Fe/H]=−1.7) evolved giant star with Teff = 5300 K and log g = 1.7.