A chemo-dynamical analysis of 115 metal-poor candidate stars selected from the narrow-band Pristine photometric survey is presented based on CFHT high-resolution ESPaDOnS spectroscopy .
We have discover 28 new bright ( V < 15 ) stars with [ Fe/H ] < -2.5 and 5 with [ Fe/H ] < -3.0 for success rates of 40 % ( 28/70 ) and 19 % ( 5/27 ) , respectively .
A detailed model atmospheres analysis is carried out for the 28 new metal-poor stars .
Stellar parameters were determined from SDSS photometric colours , Gaia DR2 parallaxes , MESA/MIST stellar isochrones , and the initial Pristine survey metallicities , following a Bayesian inference method .
Chemical abundances are determined for 10 elements ( Na , Mg , Ca , Sc , Ti , Cr , Fe , Ni , Y , Ba ) .
Most stars show chemical abundance patterns that are similar to the normal metal-poor stars in the Galactic halo ; however , we also report the discoveries of a new r-process rich star , a new CEMP-s candidate with [ Y/Ba ] > 0 , and a metal-poor star with very low [ Mg/Fe ] .
The kinematics and orbits for all of the highly probable metal-poor candidates are determined by combining our precision radial velocities with Gaia DR2 proper motions .
Some stars show unusual kinematics for their chemistries , including planar orbits , unbound orbits , and highly elliptical orbits that plunge deeply into the Galactic bulge ( R _ { peri } < 0.5 kpc ) ; also , eight stars have orbital energies and actions consistent with the Gaia-Enceladus accretion event .
This paper contributes to our understanding of the complex chemo-dynamics of the metal-poor Galaxy , and increases the number of known bright metal-poor stars available for detailed nucleosynthetic studies .